var d = document;
function iosWidth(minWidth, maxWidth) {
if (!d.getElementById("iosEW")) return "100%";
var emWidth=Math.round(d.getElementById("iosEW").offsetWidth);
var winWidth=parseInt((d.documentElement && d.documentElement.clientWidth)?d.documentElement.clientWidth:(d.body &&  d.body.clientWidth  )?d.body.clientWidth:0);
return (winWidth<=0)? "100%":(winWidth> (maxWidth*emWidth)/50)? maxWidth+"em": (winWidth< (minWidth*emWidth)/50 )?minWidth+"em":"100%";
}