function validate_required(field,alerttxt)
{
with (field)
{
if (value==null||value=="")
  {alert(alerttxt);return false}
else {return true}
}
}function validate_form(thisform)
{
with (thisform)
{
if (validate_required(inputtext1,"Please enter your Name")==false)
  {inputtext1.focus();return false}
if (validate_required(inputtext4,"Please enter your Email")==false)
  {inputtext4.focus();return false}
if (validate_required(inputtext2,"Please enter a Subject")==false)
  {inputtext2.focus();return false}
if (validate_required(inputtext3,"Please enter a Message")==false)
  {inputtext3.focus();return false}
}
}