function swapGif(imageId)
{
	var newSrc		= new String()
	var curImage 	= document.getElementById(imageId)
	var curSrc 		= new String(curImage.src)
	if(curSrc.indexOf('-over') > -1)
	{
		newSrc	= curSrc.substr(0,curSrc.length-9) + '.gif'
	}		
	else
	{
		newSrc	= curSrc.substr(0,curSrc.length-4) + '-over.gif'
	}
	curImage.src = newSrc
}