function ValidateData()
{
	var element = getElementLarge('contactDate');
	if (element.value != "")
	{
		return false;
	}
	
	var element = getElementLarge('txtFirstName');
	if (element.value == "")
	{
		alert('Please, enter your first name.');
		element.focus();
		return false;
	}
	
	var element = getElementLarge('txtLastName');
	if (element.value == "")
	{
		alert('Please, enter your last name.');
		element.focus();
		return false;
	}
	
	var element = getElementLarge('txtPhone');
	if (element.value != "")
	{		
		if(!ValidatePhone(element.value))
		{
			alert("Please, enter a valid phone number.");
			element.focus();
			return false;
		}
	}
	
	var element = getElementLarge('ddlEvents');
	if (element.selectedIndex <= 0)
	{
		alert('Please select "How did you hear events?" option.');
		element.focus();
		return false;
	}
	
	var element = getElementLarge('txtEmail');
	if (element.value == "")
	{
		alert('Please, enter your email.');
		element.focus();
		return false;
	}
	else
	{
		if(!ValidateEmail(element.value))
		{
			alert("Please check the emails address");
			element.focus();
			return false;
		}
	}
	
	var element = getElementLarge('txtComments');
	if (element.value == "")
	{
		alert('Please, enter your comments.');
		element.focus();
		return false;
	}
}

function ValidateEmail(valor) 
{
    if (/\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*/.test(valor))
	    return true;
    else
	    return false;
}

function ValidatePhone(incoming)
{
	var ValidChars = "0123456789.()- ";
	var IsCorrect=true;
	var Char;

	for (cont = 0; cont < incoming.length && IsCorrect == true; cont++) 
	{ 
		Char = incoming.charAt(cont); 
		if (ValidChars.indexOf(Char) == -1) 
			return false;
	}
	return true;
}

function getElementLarge(name)
{
	var object = null;
	var tbLargeContact=document.getElementById('tbContact'); 
	for (var i=0; i<tbLargeContact.rows.length; i++)
    {
        for (var j=0; j<tbLargeContact.rows[i].cells.length; j++)
        {
            for (var k=0; k<tbLargeContact.rows[i].cells[j].childNodes.length; k++)
            {                
                if(tbLargeContact.rows[i].cells[j].childNodes[k].id == name)
                {
                    object = tbLargeContact.rows[i].cells[j].childNodes[k];
                    return object;
                }
            }
        }
        
    }    
}