function avail(lcode, lang, form){ 
	var width =640; 
	var height =600;
	var left =(screen.width/2)-(width/2);  
	var top =(screen.height/2)-(height/2); 
	var wb_window =null; 
	var wb_features ='scrollbars =yes,resizable =no,status =no,location =no,toolbar =no,width ='+ width +',height ='+ height +',top ='+top+',left ='+left;
	if(form){ 
		form.action ="https://wubook.net/wbk/__login__/"; 
		form.target =lcode; 
		form.method ="post"; 
		wb_window =window.open('', lcode, wb_features); 
	} else { 
		var wb_location ='https://wubook.net/wbk/__login__/?lcode='+ lcode +'&lang='+ form.lang.text +'&dfrom='+ form.dfrom.text +'&dto='+ form.dto.text;
		wb_window =window.open(wb_location, lcode, wb_features); 
	} 
	if (window.focus){ try{ wb_window.focus(); } catch(e){ } };
}