Event.observe(window,'load',window_onload,false);

function window_onload(evt){

	$('txt_s').focus();
	Event.observe('txt_s', 'keydown', txt_s_onkeydown, false);

}


function s(){

	var s = encodeURIComponent($('txt_s').value);
	document.location = 'search.php?q=' + encodeURIComponent(s);

}

function txt_s_onkeydown(evt){
	var e = evt ? evt : event;
	if(!e){
		return;
	}
	var ch = e.charCode ? e.charCode : ( e.which ? e.which : e.keyCode );
	if( ch == 13 || ch == 3){
		document.location = 'search.php?q=' + encodeURIComponent($('txt_s').value);		
	}
}