version=navigator.appVersion; 
dom=document.getElementById?1:0; 

ie5=(version.indexOf("MSIE 5")>-1 &&  dom)?1:0; 
ie6=(version.indexOf("MSIE 6")>-1 &&  dom)?1:0; 
ie4=(document.all && !dom)?1:0; 
ns5=(dom && parseInt(version) >= 5) ?1:0; 
ns4=(document.layers && !dom)?1:0;


function ocultarCapa(){
	if(ns5){
		document.getElementById("cargando").style.visibility='hidden';
		document.getElementById("web").style.visibility='visible';
	}
	else if(ns4){
		document.cargando.visibility='hidde';
		document.web.visibility='show';
	}
	else{
		document.all["cargando"].style.visibility='hidden';
		document.all["web"].style.visibility='visible';
	}
}

function mostrarContenidos(){
	if(ns5){
		document.getElementById("contenidos").style.visibility='visible';
	}
	else if(ns4){
		document.contenidos.visibility='show';
	}
	else{
		document.all["contenidos"].style.visibility='visible';
	}
}

function correctPNG(){
   
   var arVersion = navigator.appVersion.split("MSIE")
   var version = parseFloat(arVersion[1])
   
   if ((version >= 5.5) && (version < 7) && (document.body.filters)){

	  for(var i=0; i<document.images.length; i++){
         var img = document.images[i]
		 var imgName = img.src.toUpperCase()
         if (imgName.substring(imgName.length-3, imgName.length) == "PNG") {
			
			var imgID = (img.id) ? "id='" + img.id + "' " : ""
            var imgClass = (img.className) ? "class='" + img.className + "' " : ""
            var imgTitle = (img.title) ? "title='" + img.title + "' " : "title='" + img.alt + "' "
            var imgStyle = "display:inline-block;" + img.style.cssText 
            if (img.align == "left") imgStyle = "float:left;" + imgStyle
            if (img.align == "right") imgStyle = "float:right;" + imgStyle
            if (img.parentElement.href) imgStyle = "cursor:hand;" + imgStyle
			var strNewHTML = "<span " + imgID + imgClass + imgTitle
            + " style=\"" + "width:" + img.width + "px; height:" + img.height + "px;" + imgStyle + ";"
            + "filter:progid:DXImageTransform.Microsoft.AlphaImageLoader"
            + "(src=\'" + img.src + "\', sizingMethod='scale');\"></span>" 

			
		  if (img.useMap) {  

			 strAddMap = "<img style=\"position:relative;margin-top:-" + img.height + "px;"
			 + "height:" + img.height + "px;width:" + img.width +"\" "
			 + "src=\"./imgs/pixel.gif\" usemap=\"" + img.useMap 
			 + "\" border=\"0\">"

			  strNewHTML += strAddMap
		  }				
			
			img.outerHTML = strNewHTML
            i = i-1
		}
      }
   }    
}

window.attachEvent("onload", correctPNG);