var COLLAPSABLE_PARENT_NAME = "collapsable";
var COLLAPSABLE_PARENT_TYPE = "div";
var COLLAPSABLE_CHILD_TYPE = "p";

var COLLAPSABLE_EXPAND = "[show answer]";
var COLLAPSABLE_SHRINK = "[hide answer]";

init = function() {
    if(document.getElementById && document.createTextNode) {
        var entries = document.getElementsByTagName(COLLAPSABLE_PARENT_TYPE);
        for(z=0;z<entries.length;z++)
            if (entries[z].className==COLLAPSABLE_PARENT_NAME)
                assignCollapse(entries[z]);
    }
}

assignCollapse = function (div) {
    var button = document.createElement('a');
    button.style.cursor='pointer';
    button.setAttribute('expand', COLLAPSABLE_EXPAND);
    button.setAttribute('shrink', COLLAPSABLE_SHRINK);
    button.setAttribute('state', -1);
    button.innerHTML='dsds';
    div.insertBefore(button, div.getElementsByTagName(COLLAPSABLE_CHILD_TYPE)[0]);

    button.onclick=function(){
        var state = -(1*this.getAttribute('state'));
        this.setAttribute('state', state);
        this.parentNode.getElementsByTagName(COLLAPSABLE_CHILD_TYPE)[0].style.display=state==1?'none':'block';
        this.innerHTML = this.getAttribute(state==1?'expand':'shrink');
    };                   
    button.onclick();
}

function rollover()
{
	if(!document.getElementById || !document.createTextNode){return;}
	var n=document.getElementById('nav');
	if(!n){return;}
	var lis=n.getElementsByTagName('li');
	for (var i=0;i<lis.length;i++)
	{
		lis[i].onmouseover=function()
		{
			this.className=this.className?'cur':'over';
		}
		lis[i].onmouseout=function()
		{
			this.className=this.className=='cur'?'cur':'';
		}
	}
}

function popUp(URL) {
			day = new Date();
			id = day.getTime();
			eval("page" + id + " = window.open(URL, '" + id + "', 'toolbar=0,scrollbars=0,location=0,statusbar=0,menubar=0,resizable=0,width=441,height=150,left = 619.5,top = 453.5');");
			}

function start() { 
  rollover();
  init(); 
	} 

window.onload=start;