function del(val){
    selectTo=document.getElementById(val);
    clearLength=selectTo.options.length;
		while (clearLength--) selectTo.options[0]=null;
}

function addOption(selectId, txt, val)
{
		//alert ('debug');
        var objOption = new Option(txt,val);
        document.getElementById(selectId).options.add(objOption);
}