function changeShippingBlock() {
	if (document.getElementById) {
		if (document.getElementById('shippingInformationBlock').style.visibility == "hidden") {
			document.getElementById('shippingInformationBlock').style.visibility = "visible";
			document.getElementById('shippingInformationBlock').style.position = "";
		} else {
			document.getElementById('shippingInformationBlock').style.visibility = "hidden";
			document.getElementById('shippingInformationBlock').style.position = "absolute";
		}
	}
}

function largeView(imgId) {
	popUp=window.open("largeView.asp?imgId=" + imgId,"largeView","width=600,height=640,toolbar=no,status=no,scrollbars=no,location=no,menubar=no,directories=no");
	popUp.focus();
}

function imgOn(imgId) {
	if (document.getElementById) {
		document.getElementById(imgId).src = "images/btn-" + imgId + "-over.jpg";
	}
}
function imgOff(imgId) {
	if (document.getElementById) {
		document.getElementById(imgId).src = "images/btn-" + imgId + ".jpg";
	}
}


function addToCartOn(imgId) {
	if (document.getElementById) {
		document.getElementById(imgId).src = "images/btn-add_to_cart-over.jpg";
	}
}
function addToCartOff(imgId) {
	if (document.getElementById) {
		document.getElementById(imgId).src = "images/btn-add_to_cart.jpg";
	}
}




function isNumeric(strNumbers) {
	var strValidCharacters = "0123456789";
	var yesOrNo = true;
	for (i=0; i < strNumbers.length; i++) {
		strChar = strNumbers.charAt(i);
		if (strValidCharacters.indexOf(strChar) == -1) {
			yesOrNo = false;
		}
	}
	return yesOrNo;
}