How to tell control name when used in a content placeholder in conjunction with a master page

Hey everyone.

I have a page that worked great before I updated it to a masterpage based page...


My problem is this -

I have a label that I hide - ID =lblAlert Visible = false
Theres also a dropdown list right next to it. (called DDL_Term)

Thanks to some very cool people here on EE, I had a small line of javascript added to the dropdown so that if a user changes the drop down, the label becomes visible, without needing a full postback.

This javascirpt attaches to the drop down with the following command:
DDL_Term.Attributes.Add("onchange", "lblAlert.style.visiblity='visible';")

The trouble is, now that this is in a master page, my alert label doesn't have an ID=lblAlert,
now it's something like _ctl0_contentPlaceHolder1_lblAlert

I can certainly hard code this, but is there a  way to get the system to use the correct value?
that way if this page ends up in a different contentPlaceHolder someday, I won't have to come back and re-code?

(I tried   DDL_Term.Attributes.Add("onchange", lblalert.ID & ".style.visiblity='visible';") but that appears to = lblalert, not _ctl0_contentplaceholder1_lblalert
thanks in advance!
- Jack
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