function popup (url, name, width, height, scrollbars)
{
	left_pos = (screen.width / 2) - (width / 2);
	top_pos = (screen.height / 2) - (height / 2);

	window.open(url, name, 'resizable=1,scrollbars='+scrollbars+',status=no,toolbar=no,menubar=no,width=' + width + ',height=' + height + ',left=' + left_pos + ',top=' + top_pos);	
	return false;
}


function externalLinks()
{
	$$('a').each(
		function (anchor) {
			if (anchor.getAttribute("href") && anchor.getAttribute("rel") == "external")
				anchor.target = "_blank";
		}
	);
}
Event.onDOMReady(externalLinks);


function emptyfield (field, defaultval, blur)
{
	if ( blur == true ) {
		if (field.value == '') {
			field.value = defaultval;
		}
	} else {
		if (field.value == defaultval) {
			field.value = '';
		}
	}
}