/**
 * Sets form's elements and submits it
 * @param Int prod_id  Product id
 * @param String comp_nr  Number that's unique in every compilation
 * @param String act  Action
 */
function setAct( act, prod_id, comp_nr )
{
	document.cart.cartProdId.value = prod_id;
	document.cart.cartCompNr.value = comp_nr;
	document.cart.cartAct.value = act;
	document.cart.submit();
}