if (document.images) {
// rollover images


function rollArray(imgname, imgtable)
{
	this.imgname = imgname;
	this.imgtable = imgtable;
}


function rollImage(sourceon, sourceoff)
{
	if(sourceon)
	{
		this.imgon = new Object
		this.imgon.src = sourceon;
	}
	if(sourceoff)
	{
		this.imgoff = new Object
		this.imgoff.src = sourceoff;
	}
}


// Function to 'activate' images. 
function imgOn(imgName, imgRoll, rollarray, rollarrayidx){
        if (document.images){
            document[imgName].src = imgRoll.imgon.src;
	    if(rollarray)
   	         document[rollarray.imgname].src = rollarray.imgtable[rollarrayidx];
	}
}

// Function to 'deactivate' images. 
function imgOff(imgName, imgRoll, rollarray, rollarrayidx){
        if (document.images){
            document[imgName].src = imgRoll.imgoff.src;
	    if(rollarray)
	       document[rollarray.imgname].src = rollarray.imgtable[rollarrayidx];
	}
}

}