function getheight() {
	 var myWidth = 0, myHeight = 0;
	  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;
		}
		return myHeight-100 // -2 x 40 for menubars, -20 for scrollbar
	}