function ValidateForm(name, subject, messageBody)
{
    var txtMessageBody =document.getElementById(messageBody);
    var txtSubject = document.getElementById(subject);
    var txtName = document.getElementById(name);
    var trimmedText="";
    var requiredFields="";
    
   
    for (var i=0; i<txtMessageBody.value.length; i++)
    {
        if (txtMessageBody.value.substr(i, 1) != " ")
            trimmedText += txtMessageBody.value.substr(i, 1);
    }
    if (trimmedText == "")
    {
        requiredFields += "Poruka\n";
        txtMessageBody.value = "";
    }
    trimmedText = "";
     for (var i=0; i<txtName.value.length; i++)
    {
        if (txtName.value.substr(i, 1) != " ")
            trimmedText += txtName.value.substr(i, 1);
    }
    if (trimmedText == "")
    {
        requiredFields += "Ime i prezime\n";
        txtName.value = "";
    }
    trimmedText = "";
    for (var i=0; i<txtSubject.value.length; i++)
    {
        if (txtSubject.value.substr(i, 1) != " ")
            trimmedText += txtSubject.value.substr(i, 1);
    }
    if (trimmedText == "")
    {
        requiredFields += "Vaš E-Mejl\n";
        txtSubject.value = "";
    }
    trimmedText = "";
    if(requiredFields != "")
    {
        alert("Obavezna polja:\n" + requiredFields);
        return false;
    }
    else
    {
        return true;
    }   
}