function validate_mail(str) {
   return (str.indexOf(".") > 2) && (str.indexOf("@") > 0 && (str.length) > 8);
}

function check_form(frmObj){
	if (frmObj.name.value == ""){
		alert("Error! Please enter your name...");
		frmObj.name.focus();
		return false;
	} else if (!validate_mail(frmObj.email.value)){
		alert("Error! Please enter a valid email address...");
		frmObj.email.focus();
		return false;
	} else if (frmObj.telephone.value == ""){
		alert("Error! Please enter your phone number...");
		frmObj.telephone.focus();
		return false;
	} else if (frmObj.type_of_enquiry.value == ""){
		alert("Error! Please enter your enquiry type...");
		frmObj.type_of_enquiry.focus();
		return false;
	} else {
		return true;
	}
}