How do I select a default value on a radio button with Javascript?

I need a javascript to mark a radio button as checked on a form that I am creating.

Here is the radio button
<input id="PC69230_rdo_97_4" type="radio" name="PC69230$givingLevels" value="rdo_97_4" onclick="rdo_OnClick(this);">

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Kyle AbrahamsSenior .Net DeveloperCommented:
function check() {
    document.getElementById("PC69230_rdo_97_4").checked = true;

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<input id="PC69230_rdo_97_4" type="radio" name="PC69230$givingLevels" value="rdo_97_4"  checked = "checked" onclick="rdo_OnClick(this);"
dauyeungAuthor Commented:
I removed the function call and it worked perfectly.  Thanks!
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