var Hoy=new Date();
var HoyCal2 = new Date();
var colorLetraOn = "#000080";
var colorLetraOff = "#ffffff";

function tabOn(nomEnlace)
{
	document.getElementById(nomEnlace).style.color=colorLetraOn;	
	document.getElementById(nomEnlace).style.textDecoration='underline';
}

function tabOff(nomEnlace)
{
	document.getElementById(nomEnlace).style.color=colorLetraOff;	
	document.getElementById(nomEnlace).style.textDecoration='none';
	
}
<!-- Replace Language function
var myhome = "http://www.rutasolar.net";
var gvString = location.pathname;
var lenguaje = new Array(4)
lenguaje[0] = "Espanol";
lenguaje[1]= "Danish";
lenguaje[2] = "English";
lenguaje[3] = "Swedish";

function replaceLanguage (idiomaNuevo) {
	//alert (idiomaNuevo);
	var re = new RegExp(lenguaje[0],"g");
	var substituto;
	//alert(gvString +"###" + location.href);
	//if ((idiomaNuevo == "Danish" ) || ( idiomaNuevo == "Swedish")) {
		// esto es temporal
	//	location.href = myhome + "/" + idiomaNuevo+ "/underconstruction.html";
		//alert ( myhome + "/" + idiomaNuevo+ "/underconstruction.html");
	//} else {
	if (location.href == "http://www.rutasolar.net/") {
		//alert("changin home page to " + idiomaNuevo);
			location.href= "http://www.rutasolar.net/"+ idiomaNuevo + "/index.html";
	} else if ((idiomaNuevo == lenguaje[0]) && ( gvString.search("index") >0)) {
		//alert("changin home page to HOME " + idiomaNuevo);
			<!-- Caso de que estamos en un index en otro idioma -->
			location.href = myhome;
	} else {
   		 if (gvString.search(re) >0 ) {
			substituto = gvString.replace(re,idiomaNuevo);
		} else {
			i = 0;
			while ((gvString.search(re) <= 0) & (i<lenguaje.length)) {
				re = new RegExp(lenguaje[i++],"g");
			}
			substituto = gvString.replace(re,idiomaNuevo);
			//alert("Substituto["+i+"]= " + substituto);
		}
	
	
		//alert("Substituto = " + substituto);
		oldPage = location.href;
		newPage = myhome + substituto;
	
   		location.href = myhome + substituto;
		//alert("resultado  ES $" + newPage +"$");
		if (newPage) {
			//alert("Si existe" );
		} else {
			//alert("This page does not exist in the language requested or is underconstruction. Please contact us for any request that can not be met on our web pages");
			location.href=oldPage;
		
			location.href="http://www.rutasolar.net/index_EN.html";
		}
	}
	//alert("resultado   "+location.href);
	//}
}

<!-- Open Window function -->

function openwindow(page, h, w, scroll) 
{ 
 	OpenWindow=window.open(page,"newwin","height="+h+",width="+w+", toolbar=no,scrollbars="+scroll+",menubar=no,resizable=yes"); 
	OpenWindow.focus();
} 

function openwindowWithName(page, nameWin, h, w) 
{ 
	OpenWindow=window.open(page, nameWin, "height="+h+",width="+w+", toolbar=no,scrollbars="+scroll+",menubar=no"); 
	OpenWindow.focus();

}