<script type="text/javascript">
	function getQueryString(name) {
	    var reg = new RegExp("(^|&)" + name + "=([^&]*)(&|$)", "i");
	    var url=decodeURI(decodeURI(window.location.search))
	    var r = url.substr(1).match(reg);
	    if (r != null) return unescape(r[2]); return null;
	}
$(document).ready(function() {
	var value=getQueryString("key");
	if(value!=null){
    		alert("key="+value);
  	}
});
</script>