adding background image to options in select box

hi guys,
im using a javascript to add options to the select box as below:

function addOption(selectbox, value, text )
{
var optn = document.createElement(“OPTION”);
optn.text = text;
optn.value = value;
selectbox.options.add(optn);
}

i wanted to add a background image to the options in the select box.
im need of the css style code for select box and its options

Please help me.

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