function validate(form) {
	var e = form.elements, m = '';
	
	if(!e['firstname'].value) {
		m += '- Your first name is required.\n';
	}
	if(!e['lastname'].value) {
		m += '- Your last name is required.\n';
	}
		if(!e['phone'].value) {
		m += '- Your phone number is required.\n';
	}
			if(!e['city'].value) {
		m += '- Your city is required.\n';
	}
var str = e['email'].value;
	var reg = new RegExp("([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})");
			
	if (!reg.test(str))
	{
		m += '- Please enter your valid email address.\n';
	}	
	if(!e['company'].value) {
		m += '- What is your company name or profession?\n';
	}
	if(!e['comments'].value) {
		m += '- Please enter questions or comments.\n';
	}
	if(m) {
		alert('The following error(s) occurred:\n\n' + m);
		return false;
	}
	return true;
}