Small custom jQuery selector that validate if an element has a data attach to himself

gistfile1.js

$.extend($.expr[':'], {
    hasData: function (obj, intStackIndex, arrProperties) {
        var arguments = arrProperties[ 3 ];
        var $this = $(obj);
        
        var isValid = false;
        if(arguments.indexOf('=') > -1){
        	arguments = arguments.split('=')
        	if($this.data(arguments[0]) == arguments[1]){
        		isValid = true;
        	}
        }else{
        	if($this.data(arguments)){
        		isValid = true;
        	}
        }
        
        return isValid;
    }
});

//exemple
$('body:hasData("map")');
$('body:hasData("map=4")');
$('body:hasData("events")'); //return true if the element has some events binded to him