function validateEmail(elemV){
	var emailExp = /^[\w\-\.\+]+\@[a-zA-Z0-9\.\-]+\.[a-zA-z0-9]{2,4}$/;
	if(elemV.match(emailExp)){
		return true;
	}else{
		return false;
	}
}

function checkform(){
	//var txt_company = document.getElementById('txt_company');
	var txt_name = document.getElementById('txt_name');
	var txt_position = document.getElementById('txt_position');
	var txt_email = document.getElementById('txt_email');
	var txt_tel = document.getElementById('txt_tel');
	var txt_enquiry = document.getElementById('txt_enquiry');
	
	if (txt_name.value == ''){
		alert (error_array[0]);
		return false;
	}
	if (txt_position.value == ''){
		alert (error_array[1]);
		return false;
	}
	if (txt_email.value == '' || !validateEmail(txt_email.value)){
		alert(error_array[2]);
		return false;
	}
	if (txt_enquiry.value == ''){
		alert(error_array[3]);
		return false;
	}
	return true;
}