window.onresize = setScreenClass;
        
	//  Following transition classes will be declared:
	//
	//	classname		  screenwidth
	//	------------------------------------------
	//	pda_v			  240px			
	//	pda_h			  320px			
	//	ultralow		  320px -  640px	
	//	screen_lo		  640px -  800px	
	//	screen_med		  800px - 1024px	
	//	screen_hi		  1024px - 1280px	
	//	screen_wide		  > 1280px			

	function setScreenClass() {
		var fmt = document.documentElement.clientWidth;
		var cls = (fmt>0&&fmt<=983)?'screen_low':(fmt>984&&fmt<=1240)?'screen_med':(fmt>1241&&fmt<=1330)?'screen_high':'screen_wide';
		//document.getElementById('rob').innerHTML=fmt+'px -> '+cls;
                document.body.className=cls;
	};