function ImgTeaser( strId, intSwap ) {
	// assumes 2 images: image.gif and image_over.gif
	var imgObj = (typeof(strId) == "object") ? strId.getElementsByTagName('img')[0] : document.getElementById( strId );
	var strTemp = imgObj.src;
	var intStrLength = strTemp.length;
	var intChop, strEnd;

	if ( intSwap ) {
		if (strTemp.indexOf('_over.gif') == -1) {
			intChop = intStrLength - 4;
			strEnd = '_over.gif';
		}
	} else {
		if (strTemp.indexOf('_over.gif') > -1) {
			intChop = intStrLength - 9;
			strEnd = '.gif';
		}
	}

	if (typeof(intChop) != "undefined") {
		strTemp = strTemp.substring( 0, intChop );
	}

	if (typeof(strEnd) != "undefined") {
		imgObj.src = strTemp + strEnd;
	}
}