<script type="text/javascript">
                         var now = new Date();
                         var year=now.getFullYear()-5;

document.write("<select name='_sName'>");

  
for(var a=1;a<=10;a++){

        document.write("<option>"+year+"</option>");

       year=year+1; 
    
}

       document.write("</select>");
          
</script>