// 5 large icons
		var home_lg_on=new Image();
		home_lg_on.src="pics/home_on.gif";
		var home_lg_of=new Image();
		home_lg_of.src="pics/home.gif";
		
		var bio_lg_on=new Image();
		bio_lg_on.src="pics/bio_lg_on.gif";
		var bio_lg_of=new Image();
		bio_lg_of.src="pics/bio_lg_of.gif";
		
		var ko_lg_on=new Image();
		ko_lg_on.src="pics/kont_lg_on.gif";
		var ko_lg_of=new Image();
		ko_lg_of.src="pics/kont_lg_of.gif";
		
		var wk_lg_on=new Image();
		wk_lg_on.src="pics/wk_lg_on.gif";
		var wk_lg_of=new Image();
		wk_lg_of.src="pics/wk_lg_of.gif";
		
		var pr_lg_on=new Image();
		pr_lg_on.src="pics/pr_lg_on.gif";
		var pr_lg_of=new Image();
		pr_lg_of.src="pics/pr_lg_of.gif";
		
		var cd_lg_on=new Image();
		cd_lg_on.src="pics/cd_lg_on.gif";
		var cd_lg_of=new Image();
		cd_lg_of.src="pics/cd_lg_of.gif";
		
		var te_lg_on=new Image();
		te_lg_on.src="pics/term_lg_on.gif";
		var te_lg_of=new Image();
		te_lg_of.src="pics/term_lg_off.gif";
	
		// 5 small icons
		var home_on=new Image();
		home_on.src="pics/home_on.gif";
		var home_of=new Image();
		home_of.src="pics/home.gif";
		
		var bio_on=new Image();
		bio_on.src="pics/bio_on.gif";//add real one
		var bio_of=new Image();
		bio_of.src="pics/biog_sm.gif";
		
		var kon_on=new Image();
		kon_on.src="pics/kon_on.gif"; //add real one
		var kon_of=new Image();
		kon_of.src="pics/kon_off.gif";
		
		var pres_on=new Image();
		pres_on.src="pics/pres_on.gif";//add real one
		var pres_of=new Image();
		pres_of.src="pics/pres_off.gif";
		
		var cd_on=new Image();
		cd_on.src="pics/cd_on.gif";//add real one
		var cd_of=new Image();
		cd_of.src="pics/cd_off.gif";
		
		var wk_on=new Image();
		wk_on.src="pics/wk_on.gif";//add real one
		var wk_of=new Image();
		wk_of.src="pics/wk_of.gif";
		
		var term_on=new Image();
		term_on.src="pics/term_on.gif";//add real one
		var term_of=new Image();
		term_of.src="pics/term_off.gif";
		
		//four more
		var lehrer_on=new Image();
		lehrer_on.src="pics/lehrer.gif";
		var lehrer_of=new Image();
		lehrer_of.src="pics/lehrer_of.gif";
		
		var musfr_on=new Image();
		musfr_on.src="pics/musfr.gif"; 
		var musfr_of=new Image();
		musfr_of.src="pics/musfr_of.gif";
		
		var solist_on=new Image();
		solist_on.src="pics/solist.gif";
		var solist_of=new Image();
		solist_of.src="pics/solist_of.gif";
		
		var wissen_on=new Image();
		wissen_on.src="pics/wissen.gif";
		var wissen_of=new Image();
		wissen_of.src="pics/wissen_of.gif";
		
	function change(imagename,objectsrc)
	{
        if (document.images)
		{
            document.images[imagename].src=eval(objectsrc+".src")
		}
    }