function validate_required(field, alerttxt)
{
with (field)
{
if (value==null || value=="" || value==" ")
{alert(alerttxt); return false}
else
{return true}
}
}

function validate_email(field,alerttxt)
{
with (field)
{
apos=value.indexOf("@")
dotpos=value.lastIndexOf(".")
if (apos<1||dotpos-apos<2)   
{
alert(alerttxt);return false}
else {return true}
}
}

function validate_form(thisform)
{
with (thisform)
{

if(validate_required(txtName,"Please enter your name")==false)
{txtName.focus(); return false}

if(validate_email(txtEmail,"Please enter a valid Email ID")==false)
{txtEmail.focus(); return false}

if (validate_required(txtDescription,"Please enter your message")==false)
{txtDescription.focus(); return false}
}
var message = "";
  message = "You have provided us the following information:" + "\n\n"
  message += "Name: " + document.frmContact.txtName.value + "\n"
  message += "Email: " + document.frmContact.txtEmail.value + "\n"
  message += "Message: " + document.frmContact.txtDescription.value + "\n\n";

var p=confirm(message + "Press Ok to Confirm or Cancel to Modify")
  if (p==true)
    {
    return true;
    }
  else
    {
    return false;
    }
}