dHTML Scrollable Area - Fix for Firefox

[jwerkowski]

To let the extension work with Firefox (as well as Opera and IE), replace the
function MoveArea with this code:

function MoveArea(x,y){
this.x=x;this.y=y
//Firefox: Must assign the value + the unit. Debugger shows "pt", not "px"
this.css.left=this.x + "pt";
this.css.top=this.y + "pt";
}