function prevision (id) {
	document.getElementById('btn_prevision_mapas').className = "";
	document.getElementById('btn_prevision_tablas').className = "";
	document.getElementById('btn_prevision_webcams').className = "";
	
	document.getElementById("btn_"+id).className = "on";
	ajaxpage('inicio/prevision.php?id='+id, 'div_prevision');
	
}
function getPageSize(){
	
	var xScroll, yScroll;
	
	if (window.innerHeight && window.scrollMaxY) {	
		xScroll = document.body.scrollWidth;
		yScroll = window.innerHeight + window.scrollMaxY;
	} else if (document.body.scrollHeight > document.body.offsetHeight){ // all but Explorer Mac
		xScroll = document.body.scrollWidth;
		yScroll = document.body.scrollHeight;
	} else { // Explorer Mac...would also work in Explorer 6 Strict, Mozilla and Safari
		xScroll = document.body.offsetWidth;
		yScroll = document.body.offsetHeight;
	}
	
	var windowWidth, windowHeight;
	if (self.innerHeight) {	// all except Explorer
		windowWidth = self.innerWidth;
		windowHeight = self.innerHeight;
	} else if (document.documentElement && document.documentElement.clientHeight) { // Explorer 6 Strict Mode
		windowWidth = document.documentElement.clientWidth;
		windowHeight = document.documentElement.clientHeight;
	} else if (document.body) { // other Explorers
		windowWidth = document.body.clientWidth;
		windowHeight = document.body.clientHeight;
	}	
	
	// for small pages with total height less then height of the viewport
	if(yScroll < windowHeight){
		pageHeight = windowHeight;
	} else { 
		pageHeight = yScroll;
	}

	// for small pages with total width less then width of the viewport
	if(xScroll < windowWidth){	
		pageWidth = windowWidth;
	} else {
		pageWidth = xScroll;
	}

	arrayPageSize = new Array(pageWidth,pageHeight,windowWidth,windowHeight) 
	return arrayPageSize;
}


function prevision_tablas(id) {
		
		if (id != "cerrar")
			{
				var objBody = document.getElementsByTagName("body").item(0);
				var objOverlay = document.createElement("div");
				objOverlay.setAttribute('id','overlay');
				objOverlay.onclick = function() { prevision_tablas('cerrar'); }
				objBody.appendChild(objOverlay);
				var arrayPageSize = getPageSize();				
				document.getElementById('overlay').style.height = arrayPageSize[1]+'px';
				objOverlay.innerHTML = '<div id="popup"><iframe id="popup_contenido" frameborder="0" scrolling="no"></iframe><a href="javascript:;" onclick="prevision_tablas(\'cerrar\')" class="btn_cerrar" title="cerrar ventana">Cerrar</a></div>';
				document.getElementById('popup_contenido').src = 'inicio/prevision_tablas.php?id='+id;
			}
		else 
			{				
				var objOverlay = document.getElementById('overlay');
				var objBody = objOverlay.parentNode;
				objBody.removeChild(objOverlay);
			}
		
		}
		
function webcams_ver (id) {
	
	
	var elementos_ul = document.getElementById('prevision_webcams').getElementsByTagName('div');
	for (i=0; i < elementos_ul.length; i++)
		{
			elementos_ul[i].className = '';
		}
	
	document.getElementById('webcams_'+id).className = 'on';	
}