// Array for images for random display.
var randomImageArray = new Array(4);
randomImageArray["Image1"] = "sharedfiles/mhr/images/user/photo_homeright8.jpg";
randomImageArray["Image2"] = "sharedfiles/mhr/images/user/photo_homeright8.jpg";
randomImageArray["Image3"] = "sharedfiles/mhr/images/user/photo_homeright8.jpg";
randomImageArray["Image4"] = "sharedfiles/mhr/images/user/photo_homeright8.jpg";


// Pre-loader array for images.
for (i=0; i < randomImageArray.length; i++)
{
//  var preload = new Image();
//  preload.src = randomImageArray['Image'+i];
}


function ShowRandomImage(thisImageName,numberOccurrences)
{
  // Swap a parsed image name (ie. name="thisImageName") and number of occurances (eg. "2" -> name="Image1", name="Image2")

  var lowerIndex = 1;
  var setCount = Math.round((randomImageArray.length - 1) / numberOccurrences);
  var upperIndex = setCount;

  for (i = 1; i <= numberOccurrences; i++)
     {  
     var thisRandomIndex = Math.round(Math.random() * (upperIndex - lowerIndex)) + lowerIndex;
     document[thisImageName+i].src = randomImageArray['Image'+thisRandomIndex];
     lowerIndex = upperIndex + 1;
     upperIndex = upperIndex + setCount;
     }
}


//--------------------------------------------------------------------------------------


// Array for 'split' images for random display. Note that each image should be split the same number of times.
var randomSplitImageArray = new Array(3);
randomSplitImageArray["Image1_1"] = "sharedfiles/mhr/images/site/home_random_left1.jpg";
randomSplitImageArray["Image1_2"] = "sharedfiles/mhr/images/site/home_random_middle1.jpg";
randomSplitImageArray["Image1_3"] = "sharedfiles/mhr/images/site/home_random_right1.jpg";


// Pre-loader array for images.
for (i=0; i < randomSplitImageArray.length; i++)
{
//  var preload = new Image();
//  preload.src = randomSplitImageArray['Image'+i];
}


function ShowRandomSplitImage(thisImageGroupName,imageSplitCount)
{
  // Swap a parsed image name group of split images (ie. name="thisImageName1" would be parsed as "thisImageName", and
  // ImageSplitCount is number of split images making a whole image)

  var numOfWholeImages = (randomSplitImageArray.length / imageSplitCount);  //ie. 8 in the array / 4 splits = 2 whole images.
  var thisRandomIndex = Math.round(Math.random() * (numOfWholeImages - 1)) + 1;  //Get a random number within the number of whole images.

  for (i = 1; i <= imageSplitCount; i++)
     {
     //Cycle through and set the split image names.
     document[thisImageGroupName+i].src = randomSplitImageArray['Image'+thisRandomIndex+'_'+i];   //eg. 'Image1_3' in the array.
     }
}