προβλημα με το scroll down

body {
background-color: #ebebeb;
background-image:url(https://i.servimg.com/u/f44/16/84/89/90/iiizii43.png);
background-attachment:fixed;
color: #5A5A5A;
font-family: tahoma,helvetica,arial,sans-serif;
font-size: 13px;
padding-bottom: 15px;
margin-top: 15px;
}

.for_topics{
margin-top: 3px !important;
}
#login_popup {
background-image: url(http://polpoinodroidi.com/wp-content/uploads/2010/02/google-chrome-logo_04-400x285.jpg);
}

#chatbox, #chatbox_members, #chatbox_footer, .chatbox_row_1, .chatbox_row_2, .chatbox_row_3, #chatbox_members .member-title {
background: none repeat scroll 0 0 #f7f7f7 !important;
}
#chatbox span .msg{
background:transparent !important;
font-family: comic san ms !important;
font-size:15px;
font-weight:bold;
}

#chatbox_members ul li {
color:transparent;
text-decoration:none;
}

.pun {
background-color: #fff;
width: 1300px;
}

#pun_out {
background color:#f5f5f5 repeat;background:rgba(0,0,0,0.18);
border:1px solid #0b2337;
border:1px solid rgba(0,0,0,0.35);
-webkit-box-shadow:inset rgba(255,255,255,0.1) 0px 0px 0px 1px;
-moz-box-shadow:inset rgba(255,255,255,0.1) 0px 0px 0px 1px;
box-shadow:inset rgba(255,255,255,0.1) 0px 0px 0px 1px;
padding:8px;
position:relative;
width: 1326px;
margin-left: auto;
margin-right: auto;
-webkit-border-radius: 4px;
-moz-border-radius: 4px;
border-radius: 4px;
}

#pun-intro {
background-color: #304154;
background-image: url("https://i.servimg.com/u/f44/16/84/89/90/iiifzi10.jpg");
background-repeat: repeat-x;
padding: 1.5em 1em 1em 1em;
border-bottom: 0px solid #296fa5;
text-align: left;
box-shadow: 0 0 5px rgba(0, 0, 0, 0.75) inset;
margin-bottom: 10px;
border: 1px solid #273749;
-webkit-border-radius: 4px;
-moz-border-radius: 4px;
border-radius: 4px;
height: 171px;
}

.main .main-head {
background-color: #1E4371;
background-image: url("https://i.servimg.com/u/f43/14/53/79/27/bg-top10.png");
background-position: 50% 50%;
background-repeat: repeat-x;
box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.25) inset, 0 1px 3px rgba(0, 0, 0, 0.3), 0 2px 0 rgba(255, 255, 255, 0.2) inset;
color: #FFFFFF;
font-size: 12px;
font-weight: bold !important;
margin-top: 15px;
padding-bottom: 13px;
padding-left: 13px;
padding-right: 13px;
padding-top: 13px;
text-shadow: 0 -1px 0 rgba(0, 0, 0, 0.25);
-webkit-border-radius: 4px 4px 0px 0px;
-moz-border-radius: 4px 4px 0px 0px;
border-radius: 4px 4px 0px 0px;
}

.pun .main-content {
background-color: #FBFBFB;
border: 1px solid #B9C4CD;
}

.pun table.table td {
background: #e6effd url(https://i.servimg.com/u/f44/16/84/89/90/eeeeee10.png) repeat-x top left;
border-top: 1px solid #B9C4CD;
border-right: 0px solid #000;
border-left: 0px solid #000;
line-height: 130%;
padding-bottom: 0.7em;
padding-left: 0;
padding-right: 0;
padding-top: 0.6em;
}
.pun .main table td.tc2, .pun .main table td.tc3 {
background: #e6effd url(https://i.servimg.com/u/f44/16/84/89/90/eeeeee10.png) repeat-x top left;
border-top: 1px solid #B9C4CD;
}

.pun table.table th {
background-image:url(https://i.servimg.com/u/f44/16/84/89/90/vvvvvv10.png);
repeat-x 0 50%;
color: #;
padding-bottom: 0.5em;
padding-left: 0;
padding-right: 0;
padding-top: 0.5em;
}

#pun-logo {
margin-left: 63px;
margin-left: -0px;
}

#pun-logo:hover { opacity: 0.9; }

.for_topics {
width: 74px;
height: 33px;
background: url("https://i.servimg.com/u/f43/14/53/79/27/fp10.png") no-repeat left top;
text-align: center;
font-size: 12px;
font-weight: bold;
line-height: normal;
color: #0e2c3e;
padding-top: 3px;
margin-top: 13px;
}

.for_topics span {
display: block;
color: #105289;
font-size: 10px;
}

.for_posts {
width: 74px;
height: 33px;
background: url("https://i.servimg.com/u/f43/14/53/79/27/fp10.png") no-repeat left top;
text-align: center;
font-size: 12px;
font-weight: bold;
line-height: normal;
color: #0e2c3e;
padding-top: 3px;
margin-left: 13px;
}

.for_posts span {
display: block;
color: #105289;
font-size: 10px;
}

.page-title h2, .page-title span {
color: #FFFFFF !important;
font-size: 14px;
font-weight: bold;
}

.pun .paged-head, .pun .paged-foot {
border: 0px solid !important;
background-color: !important;
padding: 0.6em 1.3em 0.3em 1.3em;

}

.pun .frm-form {
background: !important;
border: none;

}

#pun-head #pun-navlinks {
box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.2) inset;
background-color: #304154;
background-image: url("https://i.servimg.com/u/f43/14/73/12/96/pun-na10.png");
background-origin: padding-box;
background-position: 0 0;
background-repeat: repeat-x;
border: 1px solid #1E2831;
height: 28px;
-webkit-border-radius: 4px;
-moz-border-radius: 4px;
border-radius: 4px;
}

#pun-navlinks ul {
text-align: center;
}
#pun-navlinks li {
display: inline;
font-size: 15px;
line-height: 30px;
}
#pun-navlinks li a {
margin-left: -8px;
margin-right: -8px;
color: #fff;
font-family: tahoma,helvetica,arial,sans-serif
text-shadow: 0 -1px 0 rgba(0, 0, 0, 0.;
padding-top: 12px;
padding-left: 14px;
padding-right: 14px;
padding-bottom: 10px;
}
#pun-navlinks a, #pun-navlinks a:visited {
text-decoration: none;
}
#pun-navlinks a:active, #pun-navlinks a:focus, #pun-navlinks a:hover {
text-decoration: none;
color: #fff;
text-shadow: 0 0 4px rgba(255, 255, 255, 0.7);
padding-top: 12px;
padding-left: 14px;
padding-right: 14px;
padding-bottom: 10px;
background-color: rgba(0, 0, 0, 0.2);
}

.main .main-foot{
background-color: #fff;
color: #666;
font-weight: 400;
padding-bottom: 0.7em;
padding-left: 1.3em;
padding-right: 1.3em;
padding-top: 0.7em;
}

.pun a:link { color: #105289;text-decoration: none;}
.pun a:visited { color: #105289;}
.pun a:hover { color: #ff6600; text-decoration: none;}
.pun a:active { color: #990000;}

#pun-title {
display: none;
}

.pun .post {
border: 1px solid #CBDAEA;
margin: 10px;
background: #FDFEFF;
}

.postfoot {
border-top: 1px solid #CBDAEA;
clear: both;
margin-left: -17em;
padding-bottom: 0.5em;
padding-left: 1em;
padding-right: 1em;
padding-top: 0.5em;
text-align: right;
background: #F4FAFF;
}

.pun .postmain {
background-color: #FDFEFF;
border-left: 1px solid #CBDAEA;
margin-left: 17em;
}
.pun .posthead {
background-color: #F4FAFF;
border-bottom: 1px solid #CBDAEA;
padding-bottom: 0.5em;
padding-left: 1em;
padding-right: 1.3em;
padding-top: 0.5em;
}

.entry-content {
font-family: Verdana,Helvetica,Arial,sans-serif;
font-size: 13px;
}

.user-contact a {
background-color: #2e425a;
-webkit-border-radius: 4px;
-moz-border-radius: 4px;
border-radius: 4px;
color: #FFFFFF;
display: inline-block;
padding: 3px;
box-shadow: rgba(0,0,0,0.6) 0px 0px 2px;
-webkit-box-shadow: rgba(0,0,0,0.6) 0px 0px 2px;
-moz-box-shadow: rgba(0,0,0,0.6) 0px 0px 2px;
-khtml-box-shadow: rgba(0,0,0,0.6) 0px 0px 2px;
}

.codebox {
background-color: #E4EAF2;
margin-bottom: 1em;
margin-left: 1em;
margin-right: 1em;
margin-top: 1em;
border: 1px solid #8394B2;
border-left: 4px solid #8394B2;
}
.codebox dt {
border-bottom: 1px solid #8394B2;
padding-bottom: 0.25em;
padding-left: 0.25em;
padding-right: 0.25em;
padding-top: 0.25em;
font-weight: bold;
color: #8394B2;
}
.codebox dd {
background-color: #fff;
color: #435C7A;
margin-bottom: 1px;
margin-left: 1px;
margin-right: 1px;
margin-top: 1px;
padding-bottom: 4px;
padding-left: 4px;
padding-right: 4px;
padding-top: 4px;
}

.postmain blockquote {
background-color: #FFFFFF;
border: 1px solid #4E6A97;
padding-bottom: 0.5em;
padding-left: 1em;
padding-right: 1em;
padding-top: 0.5em;
border-radius: 3px; -webkit-border-radius: 3px; -moz-border-radius: 3px; -khtml-border-radius: 3px;
}

#pun-about {
background-color: #F4F4F4;
border: 1px solid #DDDDDD;
line-height: 150%;
padding-bottom: 0.6em;
padding-left: 1em;
padding-right: 1em;
padding-top: 0.6em;
text-align: right;

}
#pun-about ul {
list-style-type: none;
}
#pun-about ul li {
display: inline;
}
#pun-about ul li a {
font-weight: normal;
text-decoration: none;
}
#pun-about #qjump {
display: none;
}

#pun-visit, .main-box {
background-color: #F4F4F4;
border: 1px solid #B9C4CD;
margin-left: 0;
margin-right: 0;
margin-top: 0;
padding-bottom: 0.6em;
padding-left: 1em;
padding-right: 1em;
padding-top: 0.6em;

}
.pun .entry-content img {
background: none repeat scroll 0 0 #FFFFFF;
border-radius: 5px 5px 5px 5px;
box-shadow: 1px 1px 5px #B0C4DE;
margin: 8px;
max-height: 400px;
max-width: 400px;
padding: 5px;
}


.user-basic-info a img {
background-color: #FFFFFF;
padding: 6px;
margin: 2px 3px 6px;
border: 1px solid transparent;
-moz-border-radius: 8px;
-webkit-border-radius: 8px;
-khtml-border-radius: 8px;
border-radius: 8px;
box-shadow: 0 0 10px 0 #C8C8C8;
-webkit-box-shadow: 0 0 10px 0 #C8C8C8;
-moz-box-shadow: 0 0 10px 0 #C8C8C8;
}
.postbody .entry-content img[title], .postbody .entry-content img[longdesc], .vote .vote-button a img {
background: none;
padding: 0;
margin: 0;
border-radius: 0;
-webkit-border-radius:0;
-moz-border-radius:0;
-o-border-radius:0;
box-shadow: none;
-moz-box-shadow: none;
-webkit-box-shadow: none;
-o-box-shadow: none;
}

.expand, .contract {position: absolute; top: 6px; right: 10px; cursor: pointer; width: 9px; height: 9px; background: url(https://2img.net/i/fa/m/tabs_more1.gif);}
.contract {background: url(https://2img.net/i/fa/m/tabs_less1.gif);}