function changePic(pos, ident){
	if(pos=="on"){
		var imgRoll=new Image();
		imgRoll.src="../_img/bt_"+ident+"_rollOn.png";
		document.getElementById(ident).src=imgRoll.src;
		}
	if(pos=="out") {
		var imgRoll=new Image();
		imgRoll.src="../_img/bt_"+ident+".png";
		document.getElementById(ident).src = imgRoll.src;
	}
}


function externalLinks() {
	if (!document.getElementsByTagName) return;
	var anchors = document.getElementsByTagName("a");
	for(var i=0;i<anchors.length;i++){
		var anchor=anchors[i];
		if (anchor.getAttribute("href") && anchor.getAttribute("rel")=="external") anchor.target="_blank";
	}
}

window.onload = externalLinks;



// Função random background
var randombgimages = ["../../_img/fundos/fundo_01.png","../../_img/fundos/fundo_02.png","../../_img/fundos/fundo_03.png","../../_img/fundos/fundo_04.png","../../_img/fundos/fundo_05.png","../../_img/fundos/fundo_06.png", "../../_img/fundos/fundo_07.png","../../_img/fundos/fundo_08.png","../../_img/fundos/fundo_09.png","../../_img/fundos/fundo_10.png","../../_img/fundos/fundo_11.png","../../_img/fundos/fundo_12.png","../../_img/fundos/fundo_13.png","../../_img/fundos/fundo_14.png","../../_img/fundos/fundo_15.png","../../_img/fundos/fundo_16.png"];
var rbcssrule = "";
var randomnum = Math.floor(Math.random()*randombgimages.length);
if (randombgimages[randomnum].indexOf(":") != -1) { rbcssrule = "background: #111111 url("+randombgimages[randomnum].split(":")[0]+") no-repeat;" }
else { rbcssrule = "background: #111111 url("+randombgimages[randomnum]+")  no-repeat;" }
document.write('<style type="text/css"> \n');
document.write('body {'+rbcssrule+'}\n');
document.write('</style>');