function findEmailAddresses(StrObj) {
var separateEmailsBy = ", ";
var email = ""; // if no match, use this
var emailsArray = StrObj.match(/([a-zA-Z0-9._-]+@[a-zA-Z0-9._-]+\.[a-zA-Z0-9._-]+)/gi);
if (emailsArray) {
email = "";
for (var i = 0; i < emailsArray.length; i++) {
if (i != 0) email += separateEmailsBy;
email += emailsArray[i];
      }
   }
return email;
}

if(document.getElementById("email"))
{
document.getElementById("email").value = findEmailAddresses(document.URL.replace(/%40/, "@"));
}