function isEmail(string) {
    if (string.search(/^[\w-]+(\.[\w-]+)*@([\w-]+\.)+[a-zA-Z]{2,7}$/) != -1)
        return true;
    else
		return false;
}
function isNumber(string) {
    if (string.search(/^[0-9]+$/) != -1)
        return true;
    else
		return false;
}


function validate() {
if (document.feedback.improvements.value.length==0) {
		alert('Improvements is required.');
		document.feedback.improvements.focus();
		return false;
	}
if (document.feedback.fullname.value.length==0) {
		alert('Full Name is required.');
		document.feedback.fullname.focus();
		return false;
	}
if (document.feedback.email.value.length==0) {
		alert('E-Mail is required.');
		document.feedback.email.focus();
		return false;
	}
if (document.feedback.phone.value.length==0) {
		alert('Phone is required.');
		document.feedback.phone.focus();
		return false;
	}
if (document.feedback.company.value.length==0) {
		alert('Company is required.');
		document.feedback.company.focus();
		return false;
	}
	document.feedback.submit();
}