function $(id){
	return document.getElementById(id);
}

function resizeBody(){
	$('imgBorderTop').style.width = '100%';
	$('imgBorderBottom').style.width = '100%';
}

function resizeCapa(){
	$('capaTip').style.width = '60%';
	$('capaTip').style.left = '20%';
}

function opacity(id, opacStart, opacEnd, millisec){
	var speed = Math.round(millisec / 100);
	var timer = 0;
	if(opacStart > opacEnd){
		for(i = opacStart; i >= opacEnd; i--){
			setTimeout("changeOpac(" + i + ",'" + id + "')",(timer * speed));
			timer++;
		}
	}else if(opacStart < opacEnd){
		for(i = opacStart; i <= opacEnd; i++){
			setTimeout("changeOpac(" + i + ",'" + id + "')",(timer * speed));
			timer++;
		}
	}
}

function changeOpac(opacity, id){
	var object = $(id);
	$(id).style.filter = "progid:DXImageTransform.Microsoft.Alpha(opacity=" + opacity + ")";
	object.style.opacity = (opacity / 100);
	object.style.MozOpacity = (opacity / 100);
	object.style.KhtmlOpacity = (opacity / 100);
}

function showTip(){
	opacity('capaTip', 0, 60, 2000);
	$('capaTip').style.display = 'block';
}

function startTip(){
	setTimeout('showTip()',8000);
}