jQuery plugin which gets the dataset() object of an element even on older browsers.

jquery.dataset.js

jQuery.fn.extend({
    dataset: function(){
        var attributes = {};

        if(!this.length)
            return {};

        var elem = this[0];
        var attrLength = elem.attributes.length;
        
        if (elem.dataset) {
        	return elem.dataset;
        }
        
        // For no HTML5 browsers
        for (var i = 0; i < attrLength; i++) {
            var attr = elem.attributes[i];
            if(!attr.specified){
                //If IE specified == false
                //If any other specified == undefined
                continue;
            }
            else{
                if ((/^data-/).test(attr.name)) {
            	  attributes[attr.name.replace(/^data-/, "")] = attr.value;
                }
            }
        }

        return attributes;
    }
});