addEvent(window, 'load', testit);
addEvent(window, 'resize', testit);
function addEvent( obj, type, fn ){ 
   if (obj.addEventListener){ 
      obj.addEventListener( type, fn, false );
   }
   else if (obj.attachEvent){ 
      obj["e"+type+fn] = fn; 
      obj[type+fn] = function(){ obj["e"+type+fn]( window.event ); } 
      obj.attachEvent( "on"+type, obj[type+fn] ); 
   } 
} 

	function testit(){
    var browserWidth = getBrowserWidth();
	document.cookie = "screenwidth=" + escape(browserWidth);
} 
   
    function getBrowserWidth(){
    if (window.innerWidth){
        return window.innerWidth;}  
    else if (document.documentElement && document.documentElement.clientWidth != 0){
        return document.documentElement.clientWidth;    }
    else if (document.body){return document.body.clientWidth;}      
        return 0;
	}