function isArray(testObject) {   
    return testObject && !(testObject.propertyIsEnumerable('length')) && typeof testObject === 'object' && typeof testObject.length === 'number';
}

function swapOptionImage(groupid, optionid) {
	var image_div = document.getElementById('image'+groupid);
	// Default Image = img/option-list-nonselected.jpg
	
	//productOptions 0=optionID 1=optionImage
	if (isArray(productOptions)) {
		for (var i=0; i < productOptions.length; i++) {
			if (productOptions[i][0] == optionid) {
				if (productOptions[i][1] != "") {
					image_div.src = '/inc/img.php?w=50&img=/img/productOptions/' + groupid + '/' + productOptions[i][1];					
				} else {
					image_div.src = 'img/option-list-nonselected.jpg';
				}
			}
		}
	}
}