var emailvalidation
function check(){
 var str=document.form.email.value
 var filter=/^.+@.+\..{2,3}$/

 if (filter.test(str))
    emailvalidation=true
 else {
    alert("Please input a valid email address!")
    emailvalidations=false
}
 return (emailvalidation)
}


function checkbae(){
if (document.layers||document.all)
return check()
else
return true
}