function doCompare(base_url)
{
	var oElements = document.getElementsByName("cb_CompareProduct");
	if(oElements.length == 0) return false;
	var ProductIds = "";
	for(var i=0;i<oElements.length;i++)
	{
		var oCB = oElements[i];
		if(!oCB.checked) continue;
		if(ProductIds != "") ProductIds += "_";
		ProductIds += oCB.value;
	}
	if(ProductIds == "") return false;
	var url = base_url.replace("CmpIds",ProductIds);
	window.open(url,'w_compare_product');
	return true;
}