[jQuery] autocomplete

[Pitt Phunsanit]

i found some blobem from autocomplete plugin
valible isearch don't send to php script

$("#isearch").autocomplete("search_result.php?isearch="+$("#isearch").val(),{width:
542,multiple: true,matchContains:true,cacheLength:0,minChars:1,delay:0});
and if put in event
$("#isearch").keyup(function(event){

$("#isearch").autocomplete("search_result.php?isearch="+$("#isearch").val(),{width:
542,multiple: true,matchContains:true,cacheLength:0,minChars:1,delay:0});
})
it have mulitple layer
how to fix it