Need help with cat header

Code:

a:link,a:active,a:visited,a.postlink{
   color: #D0A700;
   text-decoration: none;
   font: bold;
}

a:hover{
   color: #767676;
      font: bold;
}

a.admin:hover,a.mod:hover{
   color: #767676;
}

a.but,a.but:hover,a.but:visited{
   color: #D0A700;
   text-decoration: none;
}

a.cattitle,a.cattitle:visited{
   color: #767676;
   text-transform: uppercase;
   font: bold;
}

a.cattitle:hover{
   color: #D0A700;
   text-transform: uppercase;
   font: bold;
}

a.topictitle:visited{
   color: #B28F00;
}

a.topictitle:hover{
   color: #767676;
}



font,th,td,p{
   font-family: Geneva, Arial, Helvetica, sans-serif,Trebuchet MS;
   font-size: 12px;
}

form{
   display: inline;
}

hr{
   border: 1px solid #000000;
   border-top-width: 1px;
   height: 0px;
}

img{
   border: 0 solid;
}

input{
   color: #E7E7E7;
   font: 12px Verdana,Arial,Helvetica,sans-serif,Trebuchet MS;
}

input.button,input.liteoption,.fakebut{
   background: #303030;
   border: 1px solid;
   border-color: #707070 #000000 #000000 #707070;
   color: #E7E7E7;
   font-size: 12px;
}

input.catbutton{
   background: #303030;
   border: 1px solid;
   border-color: #707070 #000000 #000000 #707070;
   font-size: 11px;
}

input.post,textarea.post{
   background: #303030;
   border: 1px solid;
   border-color: #000000 #707070 #707070 #000000;
   color: #E7E7E7;
   font: 11px Verdana,Arial,Helvetica,sans-serif,Trebuchet MS;
   padding-bottom: 2px;
   padding-left: 2px;
}

p{
   margin-bottom: 3px;
   margin-top: 2px;
}

select{
   background: #303030;
   color: #E7E7E7;
   font: 11px Verdana,Arial,Helvetica,sans-serif,,Trebuchet MS;
}

td.cathead{
   background: url(http://i25.tinypic.com/m9of1t.gif) #191919;
   color: #8E8E8E;
   font-weight: bold;
   height: 28px;
   letter-spacing: 1px;
   text-indent: 4px;
}

td.genmed,.genmed{
   font-size: 11px;
}

td.rowpic{
   background: url(http://i25.tinypic.com/wqtppk.jpg) #343434 repeat-y;
}

td.spacerow{
                background: url(http://i28.tinypic.com/17tz5z.gif) #222222 repeat-x;
}

th{
   background: url(http://i31.tinypic.com/2q1e1oz.gif) #171717;
   color: #8E8E8E;
   font-size: 12px;
   font-weight: bold;
   height: 27px;
   padding-left: 8px;
   padding-right: 8px;
   text-align: center;
   white-space: nowrap;
}

.admin,.mod{
   font-size: 12px;
   font-weight: bold;
}

.admin,a.admin,a.admin:visited{
   color: #FFA34F;
}


.code{
   background: #525252;
   border: 1px solid #000000;
   color: #FFFFB3;
   font-size: 12px;
   line-height: 125%;
}

.errorline{
   background: #2D2D2D;
   border: 1px solid #5A5A5A;
}

.explaintitle{
   color: #727272;
   font-size: 12px;
   font-weight: bold;
}



.gensmall{
   font-size: 10px;
}

.headtitle{
   color: #262626;
                font-size: 12px;
                font-weight: bold;
}

.helpline{
   background: #303030;
   border: 1 solid;
   font-size: 10px;
}

.imgfolder{
   margin: 1px 4px 1px 4px;
}

.imgspace{
   margin-left: 1px;
   margin-right: 2px;
}

.imgtopic,.imgicon{
   margin-left: 0;
}

.maintitle,h1{
   color: #999999;

                border: 0px solid;
                border-color: #000000 #707070 #707070 #000000 ;
                font-size: 12px;
                font-weight: bold;
   text-decoration: none;
}

.mod,a.mod,a.mod:visited{
   color: #006699;
}

.name{
   font-size: 12px;
   font-weight: bold;
}

.nav{
   color: #979797;
   font-size: 11px;
   font-weight: bold;
}

.postbody{
   font-size: 12px;
   line-height: 125%;
   color: #EEEEEE;
}

.postdetails{
   color: #8A8A8A;
   font-size: 11px;
}

.quote{
   background: #525252;
   border: 1px solid #000000;
   color: #E7E7E7;
   font-size: 10px;
   line-height: 125%;
}

.row1{
   background: #272727;
}

.row1,.row2,.row3,td.spacerow,td.cat,td.rowpic,th,.topnav{
   border: 1px solid;
   border-color: #707070 #000000 #000000 #707070;
}

.row2{
   background: #272727;
}

.row3{
   background: #414141;
}

.subtitle,h2{
   font-size: 12px;
                font-weight: bold;
   text-decoration: none;
}

.tblbot {
                background: url(http://i26.tinypic.com/xf2e8g.gif) repeat-x;
}

.tableleft{
                background: url(http://i28.tinypic.com/2q16tzp.gif) #2E2E2E repeat-y;
}

.tblright{
                background: url(http://i29.tinypic.com/2u6cvnl.jpg) #2E2E2E repeat-y;
}

.tbltop{
                background: url(http://i26.tinypic.com/dc4kk2.gif) #2E2E2E repeat-x;
}

.topbkg{
   background: url(http://i29.tinypic.com/ddj6lu.gif) #1A1A1A repeat-x;
   color: #000000;
   font-size: 12px;
   font-weight: bold;
   height: 120px;
   line-height: 140%;
}

.topictitle{
   font-size: 11px;
   font-weight: bold;
}

.topnav{
   background: #1D1C19;
   color: #DD6900;
   font-size: 12px;
   height: 23px;
   white-space: nowrap;
}
.imgtopic{
   filter:alpha(opacity=50);
   -moz-opacity:.50;
   opacity:.50;
}


Here is the code but i want to know what needs to be deleted from it so my catagorie images disapear so i can add my own, my site is gamersassault.co.nr and the image is on the forum catagorie headers