function randomString() {
    var rndNum = "";
	var rndStr = "";
	for (i=0; i < 10; i++) {
		rndNum = "";
    	rndNum = Math.random()
		rndNum = parseInt(rndNum * 1000);
		rndNum = (rndNum % 94) + 33;
		if((rndNum >=33) && (rndNum <=47)) {
			i--
		} else if((rndNum >=58) && (rndNum <=64)) {
			i--
		} else if((rndNum >=91) && (rndNum <=96)) {
			i--
		} else if((rndNum >=123) && (rndNum <=126)) {
			i--
		} else {
			rndStr = rndStr + String.fromCharCode(rndNum);
		}
	}
	return rndStr;
}

function popup(url,x,y) {
	window.open(url, randomString(), 'directories=no,location=no,menubar=no,resizable=yes,titlebar=yes,toolbar=no,scrollbars=yes,height=' + y + ',width=' + x ).focus();
}

function openDiv(id) { 
	for (i=1;i<=4;i++) { // so you can add more than 2 
		var divname = 'div'+i; 
		var divstyle = document.getElementById(divname).style; 
		divstyle.display=(id==divname)?'block':'none'; 
	} 
} 

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

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;
}

window.onload = function(e) {
    var cookie = readCookie("style");
    var title = cookie ? cookie : getPreferredStyleSheet();
    setActiveStyleSheet(title);
}

window.onunload = function(e) {
    var title = getActiveStyleSheet();
    createCookie("style", title, 365);
}

var cookie = readCookie("style");
var title = cookie ? cookie : getPreferredStyleSheet();
setActiveStyleSheet(title);