var bSubmitted = false;

function checkForm() {

    if (bSubmitted)
        return false;

    var errorFound = false;

    for (var i = 0; i < document.forms[0].elements.length; i++)
    {
        if ((document.forms[0].elements[i].type == "text" || document.forms[0].elements[i].type == "textarea" || document.forms[0].elements[i].type == "checkbox") && document.forms[0].elements[i].value == "")
        {        
            //form.elements[i].className = "error";
            document.forms[0].elements[i].style.backgroundColor = "#FFE4E1";
            
            document.getElementById('errorLabelClient').style.display = '';
            
            errorFound = true;
        }
    }

    if (errorFound == true)
    {
        return false;
    }
    
    bSubmitted = true;
    return true;
}
function revertForm(textbox)
{
    textbox.style.backgroundColor = ""
}