Which text field onFocus called the function?

Hi,
Question:
Is there something that can be passed to a Javascript function that tells the function which element index called it?

I'm doing some date/time verification with Javascript.
DateTime2 must be after DateTime1 and DateTime3 must be after DateTime2. DateTime1 comes from a database.
A onFocus in DateTime3 calls the function to verify that DateTime2 date is after DateTime1. Likewise an onFocus in the field after DateTime3 verifies DateTime2 and DateTime3.

Code:

---

strHtml=strHtml & "function check_isDate(day,month,year,x,what)"
strHtml=strHtml & "{"
strHtml=strHtml & "  if (!isDate(day,month,year))"
strHtml=strHtml & "  {"
strHtml=strHtml & "    alert(""Invalid "" + what);"
strHtml=strHtml & "    document.CallInfo.elements[x-3].focus();"
strHtml=strHtml & "  }"
strHtml=strHtml & "}"

---

Right now I'm hardcoding an element number (x in the above) in the function call.The purpose for this is so I can set the focus back to the field that contained the error.

I hope this makes sense.

Al.

I think this should be fairly straightforward. Try:

onFocus="check_isDate(day,month,year,i,this );

In your function, you've got:
alert(""Invalid "" + what);"

This will perhaps return somthing like "Invalid [object]", but if you change it to something like:

alert('"Invalid"' + what.name);

You should get something like "Invalid" myThing, provided you also have properly named the object that's throwing the onFocus event.

cudabean