function nWin(theURL,winName,width,height,features) {
var window_width = width+20;
var window_height = height+20;
var newfeatures= features;
var window_top = (screen.height-window_height)/2;
var window_left = (screen.width-window_width)/2;
str='width=' + window_width + ',height=' + window_height + ',top=' + window_top + ',left=' + window_left + ',' + newfeatures + '';
newWindow=window.open(theURL,winName,str);
}