//decaration
var navIndexArraySize = 4;
var navIndexArray = new Array(navIndexArraySize);
var navIndexArray_hi = new Array(navIndexArraySize);
var navIndexArraytxt = new Array(navIndexArraySize);

// initialise array
for(var i=0; i<navIndexArraySize; i=i+1) {
	navIndexArray[i] = new Image();
	navIndexArray_hi[i] = new Image();
	navIndexArraytxt[i] = new Image();
}

// load images to array
navIndexArray[0].src    = "pictures/index_de.gif"
navIndexArray_hi[0].src = "pictures/index_de_hi.gif"
navIndexArraytxt[0].src = "pictures/index_de_txt.gif"
navIndexArray[1].src    = "pictures/index_uk.gif"
navIndexArray_hi[1].src = "pictures/index_uk_hi.gif"
navIndexArraytxt[1].src = "pictures/index_uk_txt.gif"
navIndexArray[2].src    = "pictures/index_fr.gif"
navIndexArray_hi[2].src = "pictures/index_fr_hi.gif"
navIndexArraytxt[2].src = "pictures/index_fr_txt.gif"
navIndexArray[3].src    = "pictures/index_es.gif"
navIndexArray_hi[3].src = "pictures/index_es_hi.gif"
navIndexArraytxt[3].src = "pictures/index_es_txt.gif"

// functions
function navindex_roll_in (imgName, arrayelement) {
	window.document[imgName].src = navIndexArray_hi[arrayelement].src;
	window.document["txt2"].src = navIndexArraytxt[arrayelement].src;					
}

function navindex_roll_out (imgName, arrayelement, defLang) {
	window.document[imgName].src = navIndexArray[arrayelement].src;
	switch (defLang) {
		case 'de' : window.document["txt2"].src = navIndexArraytxt[0].src; break;
		case 'uk' : window.document["txt2"].src = navIndexArraytxt[1].src; break;
		case 'fr' : window.document["txt2"].src = navIndexArraytxt[2].src; break;
		case 'es' : window.document["txt2"].src = navIndexArraytxt[3].src; break;
	}
}