var myWidth = 0;
var myHeight = 0;

function size() {
  if(typeof( window.innerWidth ) == 'number' )
  	{
    //Non-IE
    myWidth = window.innerWidth;
    myHeight = window.innerHeight;
  	}
  else if(document.documentElement &&( document.documentElement.clientWidth || document.documentElement.clientHeight ) )
  	{
    //IE 6+ in 'standards compliant mode'
    myWidth = document.documentElement.clientWidth;
    myHeight = document.documentElement.clientHeight;
  	}
  else if( document.body && ( document.body.clientWidth || document.body.clientHeight ) )
  	{
    //IE 4 compatible
    myWidth = document.body.clientWidth;
    myHeight = document.body.clientHeight;
  	}
}


window.onLoad = size;
window.onResize = size;