function  UpdateAddToCartLink(product_id){
	var link_to_change = document.getElementById("addlink_" + product_id);
	var product_option = document.getElementById("product_option_" + product_id);
	
	var selectedoption = product_option.options[product_option.selectedIndex].value;
	
	link_to_change.href = "/cart/add/" + selectedoption;
	
	//new Ajax.Request('/cart/add/1', {asynchronous:true, evalScripts:true}); return false;
	//link_to_change.onclick = "new Ajax.Request('/cart/add/" + selectedoption + "', {asynchronous:true, evalScripts:true}); return false;";
	change_the_onclick(link_to_change, selectedoption);
	
}

function change_the_onclick(element_to_change, selectedoption){
		
		var f = function ()
		{
		   eval("new Ajax.Request('/cart/add/" + selectedoption + "', {asynchronous:true, evalScripts:true});");
		   return false;
		}
		
		element_to_change.onclick = f
	}