function popup(url) {
//window.open(url,popup,'location=1, scrollbars=1,toolbar=1, resizable=1, status=1, menubar=1',width=600,height=500,left='+(screen.availWidth/2-240)+',top='+(screen.availHeight/2-250)+'');

window.open(url,popwindow,'width=600,height=500,left='+(screen.availWidth/2-240)+',top='+(screen.availHeight/2-250)+',location=1, scrollbars=1,toolbar=1, resizable=1, status=1, menubar=1');

}