function emailCheck(theField){
var theField
if (document.layers||document.getElementById||document.all){
return checkemail(theField)
}
else{
return true
}
}

var testresults
function checkemail(theField){
var str = theField
var filter=/^([\w-]+(?:\.[\w-]+)*)@((?:[\w-]+\.)*\w[\w-]{0,66})\.([a-z]{2,6}(?:\.[a-z]{2})?)$/i
if (filter.test(str))
testresults=true
else{
alert("Please input a valid email address!")
testresults=false
}
return (testresults)
}