function swapImage(target_image, image_src) {
			
	var tempTarget = document.getElementById(target_image);

	if (tempTarget.src != image_src) {
		
		tempTarget.src = image_src;
		
	}

};

function swapInfo(element_id, new_contents) {

	document.getElementById(element_id).innerHTML = new_contents;

};

function popup(url, name, width, height) {
	var properties = '';

	properties += 'toolbar=no,';
	properties += 'menubar=yes,';
	properties += 'scrollbars=yes,';
	properties += 'resizable=yes,';
	properties += 'status=no,';
	properties += 'location=no,';
	properties += 'directories=no,';
	properties += 'copyhistory=no,';
	properties += 'height=' + height + ',';
	properties += 'width=' + width;

	window.open(url, name, properties);
	
}