disable the options in a 1st dropdown list based on the second dropdownlist selction in javascript

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Javascript

Hi

I need help...i have two html dropdownlist 1st is years and second is months...i need help with java-script to disable the future(upcoming) months options if the year selected is the current year but if the year selected is of the previous years enable all the options in the month dropdownlist....the dropdownlist is using the ui-multiselect widget...but the options are not being enabled please help....

here is my code:

<script>
function enable() {
var options=document.getElementById("month_selects").options;
for (var i=0, iLen=options.length; i<ilen;i++){>
options[i].disabled = false;
}
}
</script>