var cat_mouseover = function(e) {
	if (e.type == 'mouseover') {
    	this.className = 'category_product_hover';
    } else {
    	this.className = 'category_product';
    }
}

var datasmit_init = function() {
	var cat_prods = Dom.getElementsByClassName('category_product', 'DIV');
    if (cat_prods.length > 0) {
    	Event.on(cat_prods, 'mouseover', cat_mouseover);
    	Event.on(cat_prods, 'mouseout', cat_mouseover);
   	}
}

Event.onDOMReady(datasmit_init);