window.onload = setScreenClass; 
	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 = '';
		
		if(fmt <= 900){cls = 'screen_low';}
		else if(fmt <= 1200){cls = 'screen_med';}
		
		else {cls = 'screen_wide';}
		document.body.className=cls;
		
	};