var LastId;
var ImageObject = document.getElementById('RandomImage');

function ChangeImage()
{
	LastId = GetNewPictureId();
	ImageObject.src="/media(" + ImagesArray[LastId][0] + "," + ImagesArray[LastId][1] + ")/" + ImagesArray[LastId][2] + "." + ImagesArray[LastId][3];
	ImageObject.alt=ImagesArray[LastId][4];
}

function GetNewPictureId()
{
	var NewId;
	do
	{
		NewId = Math.floor(Math.random()* ImagesArray.length);
	}
	while( NewId == LastId)
	
	return NewId;
}

var Timer = setInterval('ChangeImage()',5000);