function validateForm()
{
  var name=document.forms["myForm"]["name"].value;
  var email=document.forms["myForm"]["email"].value;
  var property=document.forms["myForm"]["property"].value;
  var num_guest=document.forms["myForm"]["num_guest"].value;
  var message=document.forms["myForm"]["message"].value;

  var atpos=email.indexOf("@");
  var dotpos=email.lastIndexOf(".");
  

  if (name==null || name=="")
  {
     alertvar="* Name is Required.\n";
  }
  
  if (email==null || email=="")
  {
     alertvar+="* Email is Required.\n";
  }
  else	{
       if (atpos<1 || dotpos<atpos+2 || dotpos+2>=email.length)
     {
        alertvar+="* Not a valid e-mail address.\n";
     }
  }
  
  if (property==null || property=="")
  {
     alertvar+="* Property Name is Required.\n";
  }
  
    if (num_guest==null || num_guest=="")
  {
     alertvar+="* Number of Guest is Required.\n";
  }
  
    if (message==null || message=="")
  {
     alertvar+="* Message is Required.\n";
  }
  
  if(alertvar!=null || alertvar!="")	{
     return false;
  }
  alertvar= "";
}