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_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(name,"Please Enter Your Name !")==false)
  {name.focus();return false}
if (validate_email(email,"Enter a valid e-mail address !")==false)
  {email.focus();return false}
if (validate_required(subject,"Please Enter Your Subject !")==false)
  {subject.focus();return false}  
if (validate_required(cmt,"Enter Your Comments !")==false)
  {cmt.focus();return false}    
  
}
}