css problem in firefox but normal in ie

[category]

Hello i have a problem my website I need help with the nav var it works good in IE but in firefox its having a problem

here is the css code

#tabsH {
      padding:5px 15px 4px 6px;
      line-height:normal;
      text-align:center;
      font-size:93%;
      background:#000;
      }
    #tabsH ul {
padding:5px 0px 4px 6px;
margin:0;
      }
    #tabsH li {
      display:inline;
      margin:0;
      padding:0;
      }
    #tabsH a {

      background:url("http://exploding-boy.com/images/cssmenus/tableftH.gif") no-repeat left top;
padding:0 0 0 4px;
margin:0;
      text-decoration:none;
      }
    #tabsH a span {
      background:url("http://exploding-boy.com/images/cssmenus/tabrightH.gif") no-repeat right top;
padding:5px 15px 4px 6px;
margin:0;
      color:#FFF;
      }

    /* Commented Backslash Hack hides rule from IE5-Mac \*/
    #tabsH a span {float:none;}
    /* End IE5-Mac hack */
    #tabsH a:hover span {
      color:#FFF;
      }
    #tabsH a:hover {
      background-position:0% -42px;
      vertical-align:middle;
      }
    #tabsH a:hover span {
      background-position:100% -42px;
      vertical-align:middle;
      }

        #tabsH #current a {
                background-position:0% -42px;
        }
        #tabsH #current a span {
                background-position:100% -42px;
        }