function screenshot(title,width,height,img){
var scrt=20; var scrl=20;
param='height='+height+',width='+width+',top='+scrt+',left='+scrl+',toolbar=no,location=no,status=no,scrollbars=yes,resizable=no';
if(img==null){return false;}
url='img/'+img;
if(title==null){title='default';}
win=window.open(url,title,param);
win.focus();
}