function compareAll() {
		var allUnchecked = true;
	
		for (var i = 0; i < document.productSelectionForm.elements.length; i++) {
			var e = document.productSelectionForm.elements[i];
			if (e.type == 'checkbox') {
				if (e.checked) allUnchecked = false;
			}
		}
		if (allUnchecked) {
			for (var i = 0; i < document.productSelectionForm.elements.length; i++) {
				var e = document.productSelectionForm.elements[i];
				if (e.type == 'checkbox') {
					e.checked = true;
				}
			}
		}
		document.productSelectionForm.submit();
	}