function validate() {
	validForm = true;
	firstError = null;
	errorstring = '';
	var x = document.forms[0].elements;
	for (var i=0;i<x.length;i++) {
		if (!x[i].value)
			writeError(x[i],' This field is required');
	}
	if (x['email'].value.indexOf('@') == -1)
		writeError(x['email'],' This is not a valid email address');
	if (!W3CDOM)
		alert(errorstring);
	if (firstError)
		firstError.focus();
	if (validForm)
	{
		if(x['Total'].value > 0)
		{
			document.credit.submit();
		}
		return true;
	}
	return false;
}

function writeError(obj,message) {
	validForm = false;
	if (obj.hasError) return;
	if (W3CDOM) {
		obj.className += ' error';
		obj.onchange = removeError;
		var sp = document.createElement('span');
		sp.className = 'error';
		sp.appendChild(document.createTextNode(message));
		obj.parentNode.appendChild(sp);
		obj.hasError = sp;
	}
	else {
		errorstring += obj.name + ': ' + message + '\n';
		obj.hasError = true;
	}
	if (!firstError)
		firstError = obj;
}

function removeError()
{
	this.className = this.className.substring(0,this.className.lastIndexOf(' '));
	this.parentNode.removeChild(this.hasError);
	this.hasError = null;
	this.onchange = null;
}