function createHeaderArray(){
	hdir = "images/interface/";
	fotos = new Array();
	
	fotos[0] = hdir + "image_1.jpg";
	fotos[1] = hdir + "image_2.jpg";
	fotos[2] = hdir + "image_3.jpg";
	fotos[3] = hdir + "image_4.jpg";
	fotos[4] = hdir + "image_5.jpg";
	fotos[5] = hdir + "image_6.jpg";
	fotos[6] = hdir + "image_7.jpg";
	fotos[7] = hdir + "image_8.jpg";
	
}

function randomImg(arrName,imgName){
	var ranNum = Math.round(Math.random() * (arrName.length - 1));
	document.images[imgName].src = arrName[ranNum];
}