di questo script che ne pensi?

<script language="">
function isEmail(str) {
var supported = 0;
if(window.RegExp) {
var tempStr = "a";
var tempReg = new RegExp(tempStr);
if (tempReg.test(tempStr)) supported = 1;
}
if(!supported)
return (str.indexOf(".") > 2) && (str.indexOf("@") > 0);

var r1 = new RegExp("(@.*@)|(\\.\\.)|(@\\.)|(^\\.)");
var r2 = new RegExp("^.+\\@(\\[?)[a-zA-Z0-9\\-\\.]+\\.([a-zA-Z]{2,3}|[0-9]{1,3})(\\]?)$");
return (!r1.test(str) && r2.test(str));
}
function MyTrim(myObj){
var i
var myObjTmp
var myObjTmp2
if (myObj==null){myObj='' ; return myObj;}
if (myObj=='') {return myObj;}
for (i = 0; i < myObj.length; i++){
if(myObj.charAt(i) == ' '){
myObjTmp = myObj.substr(i+1)
}else{
if (i==0){myObjTmp = myObj;}
break;
}
}

myObjTmp2 = myObjTmp
if (myObjTmp.length > 0){
for (i = myObjTmp.length-1; i > 0; i--){// elimina gli spazi finali
if (myObjTmp.charAt(i) == ' '){
myObjTmp2 = myObjTmp.substr(0,i)
}else{
break;
}
}
}
myObj = myObjTmp2
return (myObj)
}