function OpenSector(imageName,h,w)
{           
        // to handle in IE 7.0 and Firefox 3.          
        if (window.showModalDialog) 
        {  
            var diffHeight = screen.height - screen.availHeight;
            var diffWidth = screen.width - screen.availWidth;
            window.showModalDialog("../Popup/Sector.aspx?ImageName=" + imageName + "&h=" + h + "&w=" + w ,'Show Popup Window',"dialogwidth:"+ (w+diffWidth) +"px; dialogheight: " + (h+diffHeight) + "px; resizable:yes; center:yes");
        } 
        // to handle in Firefox
        else 
        {   
            window.open("../Popup/Sector.aspx?ImageName=" + imageName + "&h=" + h + "&w=" + w ,'Show Popup Window','height='+h+',width='+w+',resizable=yes,modal=yes');
        }          
}