var ERROR_EMAIL_FORMAT		= 'Please enter a valid Email Address.';
var ERROR_NAME_FORMAT		= 'Please enter Your name.';
var ERROR_MESSAGE_FORMAT	= 'Please enter Your message.';

function __CheckForm(elementId)
{
	var elementObj	= document.getElementById(elementId);
	var patternStr	= "[0-9a-z_]+@[0-9a-z_^.]+.[a-z]{2,4}";
	var patternObj	= new RegExp(patternStr,"ig");
	
	if(!patternObj.test(elementObj.value))
	{
		alert(ERROR_EMAIL_FORMAT);
		return false;
	}
	
	return true;
}

function __CheckContuctUsForm(nameId,emailId,messageId)
{
	var nameObj		= document.getElementById(nameId);
	var emailObj	= document.getElementById(emailId);
	var messageObj	= document.getElementById(messageId);
	
	var patternStr	= "[0-9a-z_]+@[0-9a-z_^.]+.[a-z]{2,4}";
	var patternObj	= new RegExp(patternStr,"ig");
	
	var isValidFormData	=	true;
	var errorMessage	=	'';
	
	if(/^\s*$/.test(nameObj.value))
	{
		errorMessage += ERROR_NAME_FORMAT + '\n';
		isValidFormData = false;
	}
	
	if (!patternObj.test(emailObj.value))
	{
		errorMessage += ERROR_EMAIL_FORMAT + '\n';
		isValidFormData = false;
	}
	
	if(/^\s*$/.test(messageObj.value))
	{
		errorMessage += ERROR_MESSAGE_FORMAT;
		isValidFormData = false;
	}
	
	if(!isValidFormData)
		alert(errorMessage);
	
	return isValidFormData;
}