//<![CDATA[

function validate_required(field,alerttxt)
{
with (field)
{
if (value==null||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_email(email,"Not a valid e-mail address!")==false) ||
   (validate_required(Firstname,"Please insert your name!")==false) ||
   (validate_required(Comments,"You forgot to write a comment!")==false))

  {email.focus(); Firstname.focus(); Comments.focus(); return false;}  
}
}

 //]]>