ns4 = (document.layers) ? true:false 
ie4 = (document.all) ? true:false 
ng5 = (document.getElementById) ? true:false 

function hideMsg() { 
	if (ng5) document.getElementById('msg1').style.visibility = "hidden" 
	else if (ns4) document.msg1.visibility = "hide" 
	else if (ie4) msg1.style.visibility ="hidden" 

	if (ng5) document.getElementById('msg2').style.visibility = "hidden" 
	else if (ns4) document.msg2.visibility = "hide" 
	else if (ie4) msg2.style.visibility ="hidden" 

	if (ng5) document.getElementById('msg3').style.visibility = "hidden" 
	else if (ns4) document.msg3.visibility = "hide" 
	else if (ie4) msg3.style.visibility ="hidden" 
}

function showMsg(n) { 
	hideMsg(); 
	if (ng5) document.getElementById('msg' + n).style.visibility = "visible"; 
	else if (ns4) document.layers["msg" + n].visibility = "show"; 
	else if (ie4) document.all["msg" + n].style.visibility = "visible"; 
}

function validateForm(form) {
	if (form.sender.value == 'Your Name' || form.sender.value == "") {
		showMsg(1);
		this.sender.value = "Your Name";
		return;
	}
	if (form.recipient.value == 'Friends Email' || form.recipient.value == "") {
		showMsg(2);
		this.recipient.value = "Friends Email";
		return;
	}
	form.submit();
}

function clearField(form,field) {
	if (field.value == 'Your Name' || field.value == 'Friends Email') {
		field.value = "";
	}
}