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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dauyeungAsked:
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Kyle AbrahamsSenior .Net DeveloperCommented:
From:
http://www.w3schools.com/jsref/tryit.asp?filename=tryjsref_radio_checked2
<script>
function check() {
    document.getElementById("PC69230_rdo_97_4").checked = true;
}
</script>

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plusone3055Commented:
<input id="PC69230_rdo_97_4" type="radio" name="PC69230$givingLevels" value="rdo_97_4"  checked = "checked" onclick="rdo_OnClick(this);"
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dauyeungAuthor Commented:
I removed the function call and it worked perfectly.  Thanks!
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