// ==================================================
// Declare vars
var TotalRolloverImages = 10;
var ImagesFolder = "/images/";
var ImageNamePrefix = "mainnav";
var myImageNamePrefixLength = ImageNamePrefix.length;
RollOnImagesArray  = new Array();
RollOffImagesArray = new Array();

// Preload all images for main nav
for(count = 1; count <= TotalRolloverImages; count++) {
	
	RollOnImagesArray[count] = new Image();      
	RollOnImagesArray[count].src = ImagesFolder + ImageNamePrefix + count + "_on.gif"; 
	
	RollOffImagesArray[count] = new Image();      
	RollOffImagesArray[count].src = ImagesFolder + ImageNamePrefix + count + "_off.gif"; 
	
}


// ==================================================
// Roll on
function rollon(myImageName) {
	var ImageNumber = myImageName.substring(myImageNamePrefixLength);
	
	if (document.images && document.images[myImageName].complete) {
		document.images[myImageName].src = RollOnImagesArray[ImageNumber].src;
	}
	
}


// ==================================================
// Roll off
function rolloff(myImageName) {
	var ImageNumber = myImageName.substring(myImageNamePrefixLength);

	if (document.images && document.images[myImageName].complete) {
		
		document.images[myImageName].src = RollOffImagesArray[ImageNumber].src;
	}
	
}