window.onload = setScreenClass; 
	window.onresize = setScreenClass;

	//  Following transition classes will be declared:
	//
	//	classname		  screenwidth
	//	------------------------------------------
	//	pda			      320px			
	//	screen_lo		  100px -  800px	
	//	screen_med		  800px - 1280px	
	//	screen_hi				> 1280px
	//  add  <div id="count"></div>  to display size and class

	function setScreenClass(){
		var fmt = document.documentElement.clientWidth;
		var cls = 	(fmt<=320)?'pda':(fmt>320&&fmt<=800)?'screen_low':(fmt>800&&fmt<=1280)?'screen_med':'screen_hi';
	//	document.getElementById('count').innerHTML=fmt+'px -> '+cls;
		document.body.className=cls;
	};