function validate_contactus(){
	if (document.contactus_form.txtFullName.value == ""){
    	alert("Please enter your Full Name.!");
		contactus_form.txtFullName.focus();
		return false;
	} else if (document.contactus_form.txtAddress.value == ""){
    	alert("Please enter your Address.!");
		contactus_form.txtAddress.focus();
		return false;
	} else if (document.contactus_form.txtPhone.value == ""){
    	alert("Please enter your Contact Number.!");
		contactus_form.txtPhone.focus();
		return false;
	} else if (document.contactus_form.txtComments.value == ""){
    	alert("Please enter your Comments.!");
		contactus_form.txtComments.focus();
		return false;
	} else if (document.contactus_form.security_code.value == ""){
    	alert("Please enter Security Codes.!");
		contactus_form.security_code.focus();
		return false;
	} else if (document.contactus_form.txtEmail.value != ""){
		return checkmail(document.contactus_form.txtEmail);
	} else{
		return true;
	}
}

var emailfilter=/^\w+[\+\.\w-]*@([\w-]+\.)*\w+[\w-]*\.([a-z]{2,4}|\d+)$/i;
function checkmail(e){
	var returnval=emailfilter.test(e.value);
		if (returnval==false){
			alert("Please enter a valid Email Address.");
			e.select();
		}
	return returnval;
}
/* Script by Mark Lester Aņover*/