Window.print Not Working In Fully Generated Page

function PopUpWindow(w,h,urla,v)
{
document.getElementById('h1').value=v
var popUpX = (screen.width/2)-w/2; var popUpY = (screen.height/2)-h/2;
var pos = "left="+popUpX+",top="+popUpY;
window.open(urla,'myPopup',"scrollbars=yes,width="+w+",height="+h+","+pos);
}

The above function is called by the following button click event
onclick = "PopUpWindow(390,500,'gal_rhinoplastyresult.html',photos1)"
where photos1 is an image array

which opens the bellow page as follows....everything is fine but no functionality in print i.e. window.print() not working.