function validation() {
    var uname = document.getElementById('userName');
    var uemail = document.getElementById('userEmail');
    var uphone = document.getElementById('userPhone');
    var uorg = document.getElementById('userOrg');
   
    if(uname.value == "") {
        alert("Please enter Name in \"Name\" field");
        uname.focus();
        return false;
    }
    if(uemail.value == "") {
        alert("Please enter Email address in \"Email\" field");
        uemail.focus();
        return false;
    }
    apos=uemail.value.indexOf("@");
    dotpos=uemail.value.lastIndexOf(".");
    lastpos=uemail.value.length-1;
    if(apos < 1 || dotpos-apos < 2 || lastpos-dotpos > 3 || lastpos-dotpos < 2) {
        alert("Please enter valid Email_id");
        uemail.focus();
        return false;
    }
    if(uphone.value == "") {
        alert("Please enter Phone no in \"Phone\" field");
        uphone.focus();
        return false;
    }
    var checkOK = "0123456789";
    var checkStr = uphone.value;
    var allValid = true;
    var allNum = "";
   for (i = 0;  i < checkStr.length;  i++) {
    ch = checkStr.charAt(i);
        for (j = 0;  j < checkOK.length;  j++)
            if (ch == checkOK.charAt(j))
               break;
              if (j == checkOK.length) {
                   allValid = false;
                   break;
              }
            if (ch != ",")
               allNum += ch;
   }
   if (!allValid) {
       alert("Please enter only numbers in the \"Phone\" field.");
       uphone.focus();
       return (false);
   }
   if(uorg.value == "") {
      alert("Please enter Organization in \"Organization\" field");
      uorg.focus();
      return false;
   }
 
}