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

	function setScreenClass(){
		var fmt = document.documentElement.clientWidth;
		var cls = (fmt<=240)?'pda_ver':(fmt>240&&fmt<=320)?'pda_hor':(fmt>320&&fmt<=640)?'screen_ultralow':(fmt>640&&fmt<=800)?'screen_low':(fmt>800&&fmt<=1024)?'screen_med':(fmt>1024&&fmt<=1280)?'screen_high':'screen_wide';
		document.body.className=cls;
	};