preNames = new Array('n1','n2','n3','n4','n5','n6','s11','s12','s13','s21','s22','s23');
if (!document.imPrelo) document.imPrelo=new Array();
var i,j=0;
for(i=0; i<preNames.length; i++)
	if (preNames[i].indexOf("#")!=0) {
		document.imPrelo[j] = new Image;
		document.imPrelo[j++].src= 'gfx/misc/navi_' + preNames[i] + '_on.gif';
	}


function SwapImage(ImageName1, Instance1){
	ImageFile1 = 'gfx/misc/navi_' + ImageName1 + '_' + Instance1 + '.gif';
	Image1=new Image(75,50);
	Image1.src = ImageFile1;
	document[ImageName1].src = Image1.src;  
	return true;
}