var invalidaddress=new Array()
invalidaddress[0]="hotmail"
invalidaddress[1]="rocketmail"
invalidaddress[2]="yahoo"
invalidaddress[3]="zdnetmail"
invalidaddress[4]="aol"
invalidaddress[5]="comcast"
invalidaddress[6]="rr"
invalidaddress[7]="msn"
invalidaddress[8]="cox"
invalidaddress[9]="earthlink"
invalidaddress[10]="gmail"
invalidaddress[11]="mindspring"
invalidaddress[12]="sbcglobal"
invalidaddress[13]="prodigy"
invalidaddress[14]="optonline"
invalidaddress[15]="juno"
invalidaddress[16]="live"
//extend or shorten this list if neccessary

var testresults
function checkemail(){
var invalidcheck=0;
var str=document.validation.emailcheck.value
var filter=/^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/

if (filter.test(str)){
var tempstring=str.split("@")
tempstring=tempstring[1].split(".")
for (i=0;i<invalidaddress.length;i++){
if (tempstring[0]==invalidaddress[i])
invalidcheck=1
}


if (invalidcheck!=1)
testresults=true
else{
alert("Please input a more official email address!")
testresults=false
}
}
else{
alert("Please input a valid email address!")
testresults=false
}
return (testresults)
}