var newWin;

function popup(page,width,height) {
	
	if (newWin && newWin.closed!=true) newWin.close();
	
	var posx = (screen.width/2) - (width/2);		
	var posy = (screen.height/2) - (height/2);
		
	 var propsZ=(document.all||document.getElementById)?('top=' + posy + ',left=' + posx):('screenX=' + posx + ',screenY=' + posy);
	
	props = 'width=' + width + ',height=' + height + ',' + propsZ + ',marginwidth=0,marginheight=0,resizable=no,scrollbars=no,statusbars=no,toolbar=0,menubar=0,locationbar=0';
	newWin = window.open('','pop',props);
	newWin.location.href = page;
}