Inserted Product entity in Opportunity form through an Iframe using javascript in crm4.0

if(crmForm.FormType == 1)
{
// here IFRAME_Product is Iframe name used in the form.
document.all.IFRAME_Product.src="about:blank";
}
else
{

var navProducts;
var urlvar;
navProducts= document.all.navProducts;
urlvar="/sfa/opps/areas.aspx?oid=" +
crmForm.ObjectId +
"&oType=" + crmForm.ObjectTypeCode + "&security=852023&tabSet=areaProducts";
document.all.IFRAME_Product.src=urlvar;
}