<script type="text/javascript">
function isinView(element) {
var oparent = element.offsetParent;
var osleft = oID_1.offsetLeft;
var cleft = oparent.clientWidth;
if (osleft > cleft) {
alert("Expand the window to see the paragraph!");
}
}
</script>
...
<button >Click here</button>
...
<div id="oID_1" style="position: absolute; top:200px; left:1200px;">
...
</div>