var ABSOLUTE_CART_RETURN_URL = null;
function ShowElementID( elemID ){
	if (document.getElementById) {
		document.getElementById(elemID).style.visibility = 'visible';
	}
	else if (document.all) {
		eval('document.all.' + elemID + '.style.visibility="visible"');
	}
	else if (document.layers) {
		eval('document.' + elemID + '.visibility="show"');
	}
}
function HideElementID( elemID ){
	if (document.getElementById) {
		document.getElementById(elemID).style.visibility = 'hidden';
	}
	else if (document.all) {
		eval('document.all.' + elemID + '.style.visibility="hidden"');
	}
	else if (document.layers) {
		eval('document.' + elemID + '.visibility="hide"');
	}
}

function DoCartActionSubmit(){
	var hForm = document.getElementById('basket_action_form');
	if( hForm ){
		if( isNaN(hForm.pid.value) || hForm.pid.value.length <= 0 )
			return;
		if( isNaN(hForm.qty.value) || hForm.qty.value.length <= 0 ){
			alert('Please specify a quantity');
			return;
		}
		hForm.fpage.value = document.location.href;
		if( ABSOLUTE_CART_RETURN_URL != null )
			hForm.fpage.value = ABSOLUTE_CART_RETURN_URL;
		hForm.submit();
	}
}
function CartModifyClear(){
	var hForm = document.getElementById('basket_action_form');
	if( hForm ){
		hForm.act.value = 1;
		DoCartActionSubmit();
	}	
}
function CartModifyAdd( productID, qty ){
	var hForm = document.getElementById('basket_action_form');
	if( hForm && !isNaN(productID) && productID > 0 ){
		hForm.pid.value = productID;
		hForm.qty.value = qty;
		hForm.act.value = 2;
		DoCartActionSubmit();
	}		
}
function CartModifyRemove( productID ){
	var hForm = document.getElementById('basket_action_form');
	if( hForm && !isNaN(productID) && productID > 0 ){
		hForm.pid.value = productID;
		hForm.act.value = 3;
		DoCartActionSubmit();
	}		
}	
function CartModifyUpdate( productID, qty ){
	if( qty <= 0 ){
		CartModifyRemove(productID);
		return;
	}
	var hForm = document.getElementById('basket_action_form');
	if( hForm && !isNaN(productID) && productID > 0 ){
		hForm.pid.value = productID;
		hForm.qty.value = qty;
		hForm.act.value = 4;
		DoCartActionSubmit();
	}		
}

function AddCartHookPage( pageaddr ){
	ABSOLUTE_CART_RETURN_URL = pageaddr;
}