function findId(idd) { return document.getElementById(idd);}

function width_check() {
var w; w=document.documentElement.clientWidth;
var obj = findId('container');

if (w < 1025) {obj.className = 'wlt1024'; }
else if (w < 1125) {obj.className = 'w1024'; }
else if (w< 1381) {obj.className = 'w1280';}
else {obj.className = 'w1600';}

}