window.onload = function(){init_screen();}; 
window.onresize = setScreenClass;
var set_class = '';

function init_screen(){
	set_class = document.body.className;
	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':(fmt>1280&&fmt<=1600)?'screen_wide':'screen_1920';
	var bg = (fmt<=240)?'screenlow':(fmt>240&&fmt<=320)?'screenlow':(fmt>320&&fmt<=640)?'screenlow':(fmt>640&&fmt<=800)?'screenlow':(fmt>800&&fmt<=1024)?'screen_med':(fmt>1024&&fmt<=1280)?'screen_high':(fmt>1280&&fmt<=1600)?'screen_wide':'screen_1920';

	if(do_random){
		document.body.className = set_class+' '+cls+' '+body_tag+'-'+bg;
	}else{
		document.body.className = set_class+' '+cls;
	}
};