function setActiveStyleSheet(title){
	var i, a, main;
	var listo = 0;
	var index_pref=0;
	for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
		// Localizar el css por defecto 
		if (a.getAttribute("title")=="style3") index_pref=i;
		if(a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title")) {
			a.disabled = true;
			if(a.getAttribute("title") == title){
				listo = 1;
                a.disabled = false;
			}
		}
	}
  
	if(listo == 0) {    
		document.getElementsByTagName("link")[index_pref].disabled = false;
	}
  
	var title_new = getActiveStyleSheet();
	createCookie("style", title_new, 365);  
}


function getActiveStyleSheet() {
    var i, a;
    for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
        if(a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title") && !a.disabled) return a.getAttribute("title");
    }
    return null;
}

function getPreferredStyleSheet() {
    var i, a;
    for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
        if(a.getAttribute("rel").indexOf("style") != -1
           && a.getAttribute("rel").indexOf("alt") == -1
           && a.getAttribute("title")
        ) return a.getAttribute("title");
    }
    return null;
}

function createCookie(name,value,days) {
    if (days) {
        var date = new Date();
        date.setTime(date.getTime()+(days*24*60*60*1000));
        var expires = "; expires="+date.toGMTString();
    }
    else expires = "";
    document.cookie = name+"="+value+expires+"; path=/";
}

function readCookie(name) {
    var nameEQ = name + "=";
    var ca = document.cookie.split(';');
    for(var i=0;i < ca.length;i++) {
        var c = ca[i];
        while (c.charAt(0)==' ') c = c.substring(1,c.length);
        if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
    }
    return null;
}


function changeStyle(styleSwap,language) {
	estiloActual = getActiveStyleSheet();

	if (!estiloActual) {
		estiloActual = "style1";
	}
	
	numEstiloActual = (estiloActual.substring(5,6)*1);
	numEstilo = numEstiloActual + styleSwap;

	if (numEstilo >-1 && numEstilo < 4) {
		if (numEstilo == 0) { 
			setActiveStyleSheet("style0", 1);
		}
		else if (numEstilo == 1) {		
			setActiveStyleSheet("style1", 1);
		}
		else if (numEstilo == 2) {
			setActiveStyleSheet("style2", 1);
		}
		else if (numEstilo == 3) {
			setActiveStyleSheet("style3", 1);
        }
  	}
}