function okienko(url, width, height, left, top) {
var left =(screen.width-width)/2;
var top =(screen. height- height)/2;
var Win =window.open(url, "okienko", 'width='+width+',height='+height+', left='+left+', top='+top+',resizable=no, scrollbars=yes, menubar=no');
Win.window.focus(); 
}