var cabeceras=14
var cabId=0;

function refresCab(){
	var oldCabId=cabId;
	while (oldCabId==cabId) {
		cabId=Math.floor(Math.random()*cabeceras)+1;
	}
	
	if (cabId>cabeceras) cabId=1; 
	if (document.images) {
		document.images.cabecera_img.src="img/cabecera_"+cabId+".jpg";
		setTimeout("refresCab()",20000)
	}

}

function creaMarco(id, w, h,imgSrc) {
	var d0=document.createElement("div");
	d0.setAttribute("style", "position:absolute; top:0px; left:0px; width:"+w+"px; height:"+h+"px; z-index:35px;");
	var img=document.createElement("img");
	img.setAttribute("id", id+"_img");
	img.setAttribute("src", "img/"+imgSrc);
	d0.appendChild(img);
	document.getElementById(id).appendChild(d0);
	
	var d1=document.createElement("div");
	d1.setAttribute("style", "position:absolute; top:0px; left:0px; width:100%;");

	var d1_tl=document.createElement("div");
	d1_tl.setAttribute("style", "position:absolute; top:0px; left:0px; width:12px; height:12px; background: url('img/s_tl.gif') no-repeat; z-index:30px;");
	d1.appendChild(d1_tl);
	
	var d1_t=document.createElement("div");
	d1_t.setAttribute("style", "height:12px; background: url('img/s_t.gif') repeat-x; margin:0px 12px 0px 12px; z-index:30px;");
	d1.appendChild(d1_t);
	
	var d1_tr=document.createElement("div");
	d1_tr.setAttribute("style", "position:absolute; top:0px; right:0px; width:12px; height:12px; background: url('img/s_tr.gif') no-repeat; z-index:30px;");
	d1.appendChild(d1_tr);

	var d1_l=document.createElement("div");
	d1_l.setAttribute("style", "position:absolute; top:12px; left:0px; width:12px; height:"+(h-24)+"px; background: url('img/s_l.gif') repeat-y; z-index:30px;");
	d1.appendChild(d1_l);

	var d1_r=document.createElement("div");
	d1_r.setAttribute("style", "position:absolute; top:12px; right:0px; width:12px; height:"+(h-24)+"px; background: url('img/s_r.gif') repeat-y; z-index:30px;");
	d1.appendChild(d1_r);

	var d1_bl=document.createElement("div");
	d1_bl.setAttribute("style", "position:absolute; bottom:0px; left:0px; width:12px; height:12px; background: url('img/s_bl.gif') no-repeat; z-index:30px;");
	d1.appendChild(d1_bl);

	var d1_b=document.createElement("div");
	d1_b.setAttribute("style", "height:12px; background: url('img/s_b.gif') repeat-x; margin:"+(h-24)+"px 12px 0px 12px; z-index:30px;");
	d1.appendChild(d1_b);

	var d1_br=document.createElement("div");
	d1_br.setAttribute("style", "position:absolute; bottom:0px; right:0px; width:12px; height:12px; background: url('img/s_br.gif') no-repeat; z-index:30px;");
	d1.appendChild(d1_br);

	document.getElementById(id).appendChild(d1);

}