function selectItem() {

$("#street").autocomplete("/js/autocomplete.php",{
            delay:10,
            matchSubset:1,
            autoFill:false,
            matchContains:1,
            cacheLength:10,
            selectFirst:true,
            maxItemsToShow:10,
            extraParams:{search:"street",city:document.getElementById('city').value}
     });
}

$(document).ready(function(){

$("#city").autocomplete("/js/autocomplete.php",{
            delay:10,
            matchSubset:1,
            autoFill:false,
            matchContains:1,
            cacheLength:10,
            selectFirst:true,
            maxItemsToShow:10,
            onItemSelect:selectItem,
            extraParams:{search:"city"}
     });

});