jQuery hover in function -

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my script works fine without $this, when delete $this, on hover script display submenus. explain me make mistake?

$(function () {     var timeoutid;     $(".mainmenu li").hover(function () {             if (!timeoutid) {                 timeoutid = window.settimeout(function () {                     timeoutid = null;                     $(this).find('.submenu').slidedown('slow');                 }, 1500);             }         },         function () {             if (timeoutid) {                 window.cleartimeout(timeoutid);                 timeoutid = null;             } else {                 $(".submenu").slideup('slow');             }         }); });

my html:

<div id="a">    <ul class="mainmenu">    <li>       cars       <ul class="submenu">          <li><a href="#">white</a></li>          <li><a href="#">black</a></li>          <li><a href="#">red</a></li>          <li><a href="#">silver</a></li>          <li><a href="#">yellow</a></li>          <li><a href="#">other</a></li>       </ul>    </li>    <li>       tires       <ul class="submenu">          <li><a href="#">14"</a></li>          <li><a href="#">15"</a></li>          <li><a href="#">16"</a></li>          <li><a href="#">17"</a></li>          <li><a href="#">18"</a></li>       </ul>    </li> </div>

.mainmenu has more 2 submenus.

it's untested shot in dark, think you're loosing element context in hover function using context of timeout function.
use self variable store element , use after timeout expired.

$(function () {     var timeoutid;     $(".mainmenu li").hover(function () {             // store context             var self = this;              if (!timeoutid) {                 timeoutid = window.settimeout(function () {                     timeoutid = null;                     // represents context of timeout function                     // we're using stored context here                     $(self).find('.submenu').slidedown('slow');                 }, 1500);             }         },         function () {             if (timeoutid) {                 window.cleartimeout(timeoutid);                 timeoutid = null;             } else {                 $(".submenu").slideup('slow');             }         }); });

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