<script>
$(document).ready(function() {
/////
$( "#resize_id" ).resizable({
aspectRatio: true
});
/////
})
</script>
HTML
<div id="resize_id" class=resize_cl></div>
Style
<style>
.resize_cl{
padding:5px;
width:100px;
height: 80px;
background-color: #ffff00;
border: 1px solid red;
}</style>