function arun(){
var widths = screen.width;
var heights = screen.height;
var nwidths = parseInt(widths-908);
var leftside = parseInt(nwidths / 2);
if (/MSIE (\d+\.\d+);/.test(navigator.userAgent)){ //test for MSIE x.x;
 var ieversion=new Number(RegExp.$1) // capture x.x portion and store as a number
if (ieversion>5)
{
var leftsides = parseInt(leftside - 10);
document.getElementById("mains").style.right = leftsides + "px";
document.getElementById("mainhead").style.right = leftsides + "px";
}
}
else if(/Firefox[\/\s](\d+\.\d+)/.test(navigator.userAgent)){ 
 var ffversion=new Number(RegExp.$1) // capture x.x portion and store as a number
if (ffversion>1)
{
var leftsides = parseInt(leftside + 0);
document.getElementById("mains").style.right = leftsides + "px";
}
}
else
{
var leftsides = parseInt(leftside - 0);
document.getElementById("mains").style.right = leftsides + "px";
}
}