function changeImgSrc( imgId, imgSrc ) {
	document.getElementById( imgId ).src = imgSrc;
}

function hideTag ( tagID ) {
	var i = 0;
	while( i < hideTag.arguments.length ) {
		var TagObj =  document.getElementById(hideTag.arguments[i]);
		if( TagObj ){  TagObj.style.display = "none"; }
		i++;
	}
}

function showTag( tagID ) {
	var i = 0;
	while( i < showTag.arguments.length ) {
		var TagObj = document.getElementById(showTag.arguments[i]);
		if( TagObj ) { TagObj.style.display = 'block'; }
		i++;
	}
}

function showHideTag( tagID ) {
	var TagObj = document.getElementById( tagID );
	if( TagObj.style.display == 'block' ) {
		hideTag( tagID )
	} else {
		showTag( tagID );
	}
}