//	++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 
//   Javascript for Musky Marketing Inc.  
//   Corporate Website
//   
//	 Purpose: Functions used only on the Home (index.htm) page of
//	 		  the site.  Code for rollover center image, and frame
//			  breakout checks.  Also code to display a random image 
//			  from an array in the center panel.
//
//  
//   --------------------------------------------------------
//
//	 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

//Provides compatibility between MS IE and Netscape
if (br == "nn")
{
   visible = 'show';
   hidden = 'hide';
}
else if (br == "ie")
{
  visible = 'visible';
  hidden = 'hidden';
}
else if (br == "nn6")
{
  visible = 'visible';
  hidden = 'hidden';
}

//Displays upgrade notice to Netscrap 4.x users
if (br == "nn")
{
alert("Due to the use of advanced technology, this page will not \n display correctly in Netscape Navigator 4.x \n\n We strongly urge you to upgrade to Netscape 6.x, or Internet Explorer 5.x \n\n We apologize for any inconvenience this may cause. \n\n Use the links a the bottom of the page to find the \n latest version of your preferred browser.");
}

//Handles Main Page Image swaping
function barTog(backImg, topImg, newImg) {
var NN4 = document.layers? true : false; //Netscape Navigator 4.x.
var IE4 = document.all? true : false; // IE version 4 and above.
var NN6 = (!document.all && document.getElementById)? true : false;

  if (NN4) {
    daTopImg = document.layers[topImg];
    daBackImg = document.layers[backImg];
    daNewImg = document.layers[newImg];

  } else if (IE4) {
    daTopImg = document.all(topImg);
    daBackImg = document.all(backImg);
    daNewImg = document.all(newImg);
  }
  else if (NN6)
  {
   daTopImg = document.getElementById(topImg);
    daBackImg = document.getElementById(backImg);
    daNewImg = document.getElementById(newImg);
	}

  if (daBackImg.style.visibility == visible) {

    daBackImg.style.visibility = hidden;
	daTopImg.style.visibility = visible;
	daNewImg.style.visibility = hidden;
  }
  else
  {

    daNewImg.style.visibility = visible;
	daTopImg.style.visibility = hidden;
	daBackImg.style.visibility = visible;

  }

  lastMenu = daBackImg;

}


//Code to manage random image diplay

var randomNum;

picsBack1 = new Array("centerback1a","centerback2a","centerback3a","centerback4a");
picsBack2 = new Array("centerback1b","centerback2b","centerback3b","centerback4b");

randomNum = Math.round((Math.random() * (picsBack1.length - 1)));

function randomBack1Image()
{
 document.write('<IMG SRC="images/centralbackground/' + picsBack1[randomNum] + '.jpg">');
}

function randomBack2Image()
{
 document.write('<IMG SRC="images/centralbackground/' + picsBack2[randomNum] + '.jpg">');
}


//Frame breakout code
setTimeout ("changePage()", 1);
function changePage()
{
 if (self.parent.frames.length != 0)
	self.parent.location=document.location;
}