javascript - validation for two select box using array -

i have array 'a' this

            var = new array();              a[key] =a[value];              a['mpp']='mpp';              a['pdf']='pdf';              a['excel']='xls';              a['word']='doc';              a['ppt']='ppt';              a['html']='html'; 

i have 2 select box 1 docformat contains a[key] , extension contains a[value], on submit have validate 2 select box array , can please suggest help?

one way using jquery

function validate(){     var key = $("#select-key").val(),         val = $("#select-value").val();     return key in && a[key] == val; } 

assuming a array , select boxes have ids select-key , select-value respectively.
hope helps.