How can i get the h:selectOneRadio value with javascript

Hi all.
I have this code
<h:selectOneRadio id="color" style="font-family: Arial;font-weight:lighter;font-size: 12px" onclick="showColor()" >
<f:selectItem itemLabel="RED" itemValue="1" />
<f:selectItem itemLabel="BLUE" itemValue="2" />
</h:selectOneRadio>
And javascript function is
function showColor()
var tipoRelacion = document.getElementById("form:color").value;
alert("color" + tipoRelacion);
And what i get is that color is undefined. How can i get the value of the selected radio?
Thanks a lot

you just need to pass this while calling javascript function
check this-
<h:selectOneRadio id="color" style="font-family: Arial;font-weight:lighter;font-size: 12px" onclick="showColor(this)" >
<f:selectItem itemLabel="RED" itemValue="1" />
<f:selectItem itemLabel="BLUE" itemValue="2" />
</h:selectOneRadio>
And javascript function is
function showColor(obj)
var val = obj.value
alert("color" +val);
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