var v_css  = document.createElement('link');
		v_css.rel = 'stylesheet';
		v_css.type = 'text/css';
		
		if (document.body && document.body.offsetWidth) {
 			xwidth = document.body.offsetWidth;
 			yheight = document.body.offsetHeight;
		}
		
		if (document.compatMode=='CSS1Compat' && document.documentElement && document.documentElement.offsetWidth ) {
 			xwidth = document.documentElement.offsetWidth;
			yheight = document.documentElement.offsetHeight;
		}
		
		if (window.innerWidth && window.innerHeight) {
		 xwidth = window.innerWidth;
		 yheight = window.innerHeight;
		}

		if ((xwidth<=1440) && (yheight<=800)){
			v_css.href = 'low/default.css';
		}else{
			v_css.href = 'high/default.css';
		}

		document.getElementsByTagName('head')[0].appendChild(v_css);