// preload images
function preload(id,img) {
	image0 = new Image();
	image0.src = img;
}

// swap image
function swapImage(image) {
	document.getElementById("mainimage").src = image;
}

// swap teaser text
function swapTeaser(id) {
	for (i=0; i < 5; i++){
	tes = 'teaser' + i;
		if(!(tes == id)) {
   			document.getElementById(tes).style.visibility = 'hidden';
   		}	
   		if(tes == id) {
   			document.getElementById(tes).style.visibility = 'visible';
   		}
    };
}

// open popup window
function openWindow(theURL,winName,features) { //v2.0
  window.open(theURL,winName,features);
}

//return by id
function return_by_id(id){
	if (document.getElementById) 
		var return_var = document.getElementById(id); 
	else if (document.all) 
		var return_var = document.all[id]; 
	else if (document.layers) 
		var return_var = document.layers[id]; 
	else return false;
	return return_var;
}