troubleshooting Question

Control if getElementById is returning something or not - Question

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mammaMia asked on
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I have a java script that disables a button if the user clicks on a hyperlink:

function disableButton() {
var theButton;
theButton = document.getElementById ('dg__ctl2_rb1');
theButton.disabled= true;

Is it possible do first check if the Button is on the page or not (sometimes the button isn’t on the page), because if I run the script and the button isn’t on the page I get a java-error. I don’t want to do this on the server-side, I mean if the button isent on the page I don’t write the script to the page when the client calls on it.

One more question: I know that Netscape 7.0 supports getElementById, but does any prior version support it? The same thing goes for IE 6.0, does any prior version support it?
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