function divShowAndHideImage(asLayerID,asVisility,asImgID,asImgSrc) { // 'visible' or 'hidden'
	
	// check validity of file to enlarge
	if (!(asVisility == 'visible' && asImgSrc.toLowerCase().indexOf("jpg") == -1)) {
		// set image
		document.getElementById(asImgID).src = asImgSrc;
		
		// set layer
		sty = document.getElementById(asLayerID).style;
	
		sty.visibility = asVisility;
	}
//	sty.top = (coory-66+ document.body.scrollTop);
//	sty.left = (coorx+80);
}