css left attribute alternative?

[Guardian-Mage]

.dropmenu 
{
   position: absolute;
   left: -1500px;
   visibility: visible;
   z-index: 101;
   float: left;
   width: 124px;
   border-width: 0px;
   border-style: solid;
   border-color: #000000;	
   background-color: #D4D4D4;
}

That is part of a css file for my DHTML menu. That will not work in firefox with the DTD set to XHTML 1.1 Strict. Is there any alternative that would work?

[jcombs_31]

I think people use text-indent for this sometimes.