function openwin(winurl,winname,winfeatures,w,h){c='';l=(screen.width-w)/2;t=(screen.height-h)/2;wndPos='top='+t+',left='+l;if(winfeatures.length>0)c=',';newwin=window.open(winurl,winname,winfeatures+c+'width='+w+',height='+h+','+wndPos);newwin.focus();}