// check web page format - called for either missionary or organization
function checkWebPage() {
	var webPage = document.getElementById("webpage").value;
//alert ("check WebPage");
	if (isEmpty(webPage)) {				// web page not required
			webPageValid = true;
		} else {						// not empty
			if (isURL(webPage)) {		// returns true if valid
				webPageValid = true;
			} else {
				webPageValid = false;
		}
	}

	if (webPageValid) {					// returns true if valid
		document.getElementById("webpage").className="valid";
		document.getElementById("webpage_err").value ="";
		document.getElementById("webpage_err").className="no-err";
	} else {
		document.getElementById("webpage").className="invalid";
		document.getElementById("webpage_err").value =err_web;
		document.getElementById("webpage_err").className="err";
	}
}