function take_a_car() {


var selcarid = document.getElementById('f_mark').selectedIndex;
var selcartext = document.getElementById('f_mark').options[selcarid].value;
var objname = 'f_mark_'+selcartext;


var selmodelid = document.getElementById(objname).selectedIndex;
var selmodeltext = document.getElementById(objname).options[selmodelid].value;



document.location.href='http://navishop.ru/index.php?searchstring='+selcartext+'+'+selmodeltext;




}


function openClose()
{

var selmenus = document.getElementsByTagName('select');
if(selmenus){
 for(i = 0, len = selmenus.length; i < len; i++){
  if(selmenus[i].id.indexOf('f_mark_') == 0) {selmenus[i].style.display='none';}

 }
} 

var selcarid = document.getElementById('f_mark').selectedIndex;
var selcartext = document.getElementById('f_mark').options[selcarid].value;
var objname = 'f_mark_'+selcartext;

document.getElementById(objname).style.display='';

}