function Button(dateiname_normal, dateiname_aktiv, istGeklickt){
   this.aktiv      = new Image();
   this.normal     = new Image();
   this.geklickt   = false;
   this.aktiv.src  = dateiname_aktiv;
   this.normal.src = dateiname_normal;
}

var bilder = new Array();
var aktiv;
preloadPics();

function preloadPics(){
bilder["home"]=new Button("./img/nav/home.gif","./img/nav/home_akt.gif",true);
bilder["objectives"]=new Button("./img/nav/objectives.gif","./img/nav/objectives_akt.gif");
bilder["work_plan"]=new Button("./img/nav/work-plan.gif","./img/nav/work-plan_akt.gif");
bilder["partners"]=new Button("./img/nav/partners.gif","./img/nav/partners_akt.gif");
bilder["contact"]=new Button("./img/nav/contact.gif","./img/nav/contact_akt.gif");
}

function over(id){
	isDesc=id.indexOf("_desc");
	if(isDesc>0) id=id.substring(0,isDesc);
	
	element=document.getElementById(id);
	element.src=bilder[id].aktiv.src;
	//document.getElementById(id+'_desc').style.color='white';
	document.getElementById(id+'_link').style.fontWeight='bold';
	document.getElementById(id+'_link').style.fontSize='13px';
	
}

function out(id){
	isDesc=id.indexOf("_desc");
	if(isDesc>0) id=id.substring(0,isDesc);
	if (aktiv!=id){
		document.getElementById(id).src=bilder[id].normal.src;
	}
	//document.getElementById(id+'_desc').style.color='#AF161B';
	document.getElementById(id+'_link').style.fontWeight='normal';
	document.getElementById(id+'_link').style.fontSize='11px';
}

function klick(id){
	isDesc=id.indexOf("_desc");
	if(isDesc>0) id=id.substring(0,isDesc);
	if(aktiv!=''&&aktiv!=null&&aktiv!="undefined"&&aktiv!="null"&&aktiv!=id){
		document.getElementById(aktiv).src=bilder[aktiv].normal.src;
	}
	aktiv=id;
	document.getElementById(aktiv).blur();
}