[같은폴더 mob.js]

function mobtop(id) {
var mob = document.getElementById(id);
var mob = "";
alert(screen.width);
if (screen.width > "1023"){
mob += '<div id="quick" style="position:absolute;z-index:2;width:100px;left:50%;margin-left:489px;">';
mob += ' <ul><li><a href="#"><img src="../images/common/quick.png" border="0" ></a></li></ul>';
mob += '</div>';
} else if (screen.width < "1024"){
mob = 'a'
}
mobtop.innerHTML = mob;
}

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[같은폴더 A.php]

<load target="/mob.js" />
<div id="mobtop"></div>

html 노출이 안되는데 뭐가 문제일까요??