function OpenWindow( URL, name, w, h ){
  	
  	var a = screen.availWidth;
  	var b = screen.availHeight;
	
  	var nPosX = (a-(a/2))-(w/2); 
  	var nPosY = (b-(b/2))-(h/2); 
  
	window.open ( URL, name,'width=' + w + ',height=' + h + ',resizable=yes,scrollbars=no,top='+nPosY+',left='+nPosX);
	return false;
	
}


function preLoadNavi(){
	
	MM_preloadImages(	'bilder/navi/navi_01_over.gif', 
						'bilder/navi/navi_02_over.gif',
						'bilder/navi/navi_03_over.gif',
						'bilder/navi/navi_04_over.gif',
						'bilder/navi/navi_05_over.gif',
						'bilder/navi/navi_06_over.gif',
						'bilder/navi/navi_07_over.gif'
	);
	
}


function isArray(obj) {
   if (obj.constructor.toString().indexOf("Array") == -1)
      return false;
   else
      return true;
}