<script type="text/javascript">
function a_value(o) {
var data = { city: "Васюки", date: "20120318" };
$('#forecast').load( "http://site.ru/stest", data );
}
</script>
<input type="text" value="dd-mm-yy"
onfocus="this.select();lcs(this)"
onclick="event.cancelBubble=true;this.select();lcs(this)"
onchange="a_value(this);"
>