function changeClassname(elementID_, className_)
{
	document.getElementById(elementID_).className=className_;
}

function changeImage(elementID_, imageSrc_)
{
	document.getElementById(elementID_).src = imageSrc_;
}

function changeBgImage(elementID_, imageSrc_)
{
	document.getElementById(elementID_).style.backgroundImage = 'url('+imageSrc_+')';
}