var button = new Array();

button[0] = new Image();
button[0].src = "img/buttons/button_referenzen_on.gif";

button[1] = new Image();
button[1].src = "img/buttons/button_leistungen_on.gif";

button[2] = new Image();
button[2].src = "img/buttons/button_kontakt_on.gif";

button[3] = new Image();
button[3].src = "img/buttons/button_impressum_on.gif";


function doOver(imgName) {
	if (document.images[imgName].clicked != true) 
	{
		document.images[imgName].src = "img/buttons/button_"+imgName+"_on.gif";
	}
}

themes = new Array('referenzen','leistungen','kontakt','impressum');

function doOn(imgName) {
	if (imgName) 
	{
  	for (i=0;i<themes.length;i++) 
  	{
  		if (themes[i] == imgName) 
  		{
    		document.images[imgName].clicked = true;
      	document.images[imgName].src = "img/buttons/button_"+imgName+"_on.gif";
    	} 
  		else 
  		{
    		document.images[themes[i]].clicked = false;
    		doOff(themes[i]);		
  		}
  	}
	}
}

function doOff(imgName) {
	if (document.images[imgName].clicked != true) 
	{
		document.images[imgName].src = "img/buttons/button_"+imgName+"_off.gif";
	}
}