finally i got the answer i just changed the code to this
<script>
var label;
var value;
$(document).ready(function(){
$("#tag").autocomplete({
source:'autocomplete.php',
minLength:1,
select: function (event, ui)
{
label = ui.item.label;
value = ui.item.value;
$("#authnames").val(value);
console.log("hi");
//alert(label);
alert(value);
$("#qid").autocomplete({
source:'autocompletequote.php?postcode='+value,
minLength:1,
select: function (event, ui)
{
var label1 = ui.item.label;
var value1= ui.item.value;
console.log("hi");
//alert(label);
//alert(value);
}
});
}
});
});
</script>
now everything is A OK