var win = null;
function NewWindow(mypage,myname,w,h,scroll){
LeftPosition = (screen.width) ? (screen.width-w)/2 : 0;
TopPosition = (screen.height) ? (screen.height-h)/2 : 0;
settings =
'height='+h+',width='+w+',top='+TopPosition+',left='+LeftPosition+',scrollbars='+scroll+',resizable'
win = window.open(mypage,myname,settings)
win.focus()
}

//to call a window : NewWindow(URL, NAME, WIDTH, HEIGHT, SCROLL)
//<a href="details/adyra_eb.htm" onclick="NewWindow(this.href,'name','605','365','no');return false" class="popup">