// Popup Windows

function quiz(url) {
var OpenWindow=window.open(url,"",'status=no,toolbar=no,resizable=yes,width=530,height=375,screenX=50,left=50,screenY=50,top=50');
OpenWindow.focus();
}

function animation(url) {
var OpenWindow=window.open(url,"",'status=no,toolbar=no,resizable=yes,width=530,height=350,screenX=50,left=50,screenY=50,top=50');
OpenWindow.focus();
}

function news(url) {
var OpenWindow=window.open(url,"",'status=no,toolbar=no,resizable=yes,scrollbars=yes,width=570,height=400,screenX=50,left=50,screenY=50,top=50');
OpenWindow.focus();
}


// resize popup image window

function PopupPic(sPicURL) { 
	window.open("../img/popup.htm?"+sPicURL, "", "resizable=1,HEIGHT=200,WIDTH=500");
}

// Bookmark a page

function addToFavorites()
 {
  if (window.external)
  {
   window.external.AddFavorite(urlAddress,pageName)
  }
  else
  { 
   alert("Sorry! Your browser doesn't support this function.");
  }
 }

      function customImageLinks() {
              if (!document.getElementsByTagName) return;
              var anchors = document.getElementsByTagName('a');
              for (var i=0; i<anchors .length; i++) {
                   anchor = anchors[i];
                      var images = anchor.getElementsByTagName('img');
                      if (images[0] != null) {
                              anchor.className = "image";
                      }
              }
      }
       
      if (window.addEventListener)
              window.addEventListener("load", customImageLinks, false)
      else if (window.attachEvent)
              window.attachEvent("onload", customImageLinks)
      else if (document.getElementById)
              window.onload=customImageLinks
 
 // Email a friend
 
function e_friend()
{
var e_add= prompt('Enter your friend\'s email address:',' ');
var subj= prompt('Enter the subject of your message:',' ');
if ((subj==" ") || (subj==null))
 subj="W. W. Norton and Company: Essentials of Geology, 2 ed. Website Referral";
u = window.location;
window.location="mailto:"+e_add+"?subject="+subj+"&body=Check out this W. W. Norton and Company: Essentials of Geology, 2 ed. Website Page: "+u;
}