originalImages=new Array();
originalImages['gallery']=new Image();
originalImages['gallery'].src="./img/buttons/galeria_en.gif";
originalImages['contact']=new Image();
originalImages['contact'].src="./img/buttons/kontakt_en.gif";
originalImages['links']=new Image();
originalImages['links'].src="./img/buttons/linki_en.gif";
originalImages['news']=new Image();
originalImages['news'].src="./img/buttons/najnowsze_en.gif";
originalImages['aboutme']=new Image();
originalImages['aboutme'].src="./img/buttons/oautorze_en.gif";
originalImages['publications']=new Image();
originalImages['publications'].src="./img/buttons/publikacje_en.gif";

overImages = new Array();
overImages['gallery']=new Image();
overImages['gallery'].src="./img/buttons/galeria_over_en.gif";
overImages['contact']=new Image();
overImages['contact'].src="./img/buttons/kontakt_over_en.gif" ;
overImages['links']=new Image();
overImages['links'].src="./img/buttons/linki_over_en.gif" ;
overImages['news']=new Image();
overImages['news'].src="./img/buttons/najnowsze_over_en.gif" ;
overImages['aboutme']=new Image();
overImages['aboutme'].src="./img/buttons/oautorze_over_en.gif" ;
overImages['publications']=new Image();
overImages['publications'].src="./img/buttons/publikacje_over_en.gif" ;

function lighten(id)
{
	document.getElementById(id).src=overImages[id].src;
}

function darken(id)
{
	document.getElementById(id).src=originalImages[id].src;
}