JavaScript - Selección automática dropdown

<div id="A1">

    <ul id="B1" class="CLASE1">

        <li class="CLASE2" id="C1"><a href="javascript:void(0)">Opción 1</a></li>

        <li class="CLASE2" id="C2"><a href="javascript:void(0)">Opción 2</a></li>

        <li class="CLASE2" id="C3"><a href="javascript:void(0)">Opción 3</a></li>

        <li class="CLASE2" id="C4"><a href="javascript:void(0)">Opción 4</a></li>

   </ul>

</div>

document.getElementById('#selectID').selectedIndex = #value;

window.onload = function()

{

    var cookieVal = readCookie('askselectBoxValue');

    if(cookieVal!=null)

    {

        document.getElementById('askselectBox').selectedIndex = cookieVal;

    }

}

function askchangeSelectedvalue()

{

    var mySelectedIndex = document.getElementById('askselectBox').selectedIndex;

    createCookie("askselectBoxValue",mySelectedIndex,1000);

}

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 var 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 eraseCookie(name) {

	createCookie(name,"",-1);

}