<html>
<body>
<form>
<script>
function function1() {
document.all.R1.checked = true;
}
function function2() {
document.all.R2.checked = true;
}
function function3() {
document.all.R3.checked = true;
}
function function4() {
document.all.R4.checked = true;
}
</script>
<input id="R1" type="radio" name="radiobutton" value="radiobutton">VISA
<input id="R2" type="radio" name="radiobutton" value="radiobutton">MASTERCARD
<input id="R3" type="radio" name="radiobutton" value="radiobutton">DISCOVER
<input id="R4" type="radio" name="radiobutton" value="radiobutton">AMERICAN EXPRESS
<br>
<input type="button" value="VISA checked" onClick="function1();">
<input type="button" value="MASTERCARD checked" onClick="function2();">
<input type="button" value="DISCOVER checked" onClick="function3();">
<input type="button" value="AMERICAN EXPRESS checked" onClick="function4();">
</form>
</body>
</html>
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