function ylib_Browser()
{
	d=document;
	this.agt=navigator.userAgent.toLowerCase();
	this.major = parseInt(navigator.appVersion);
	this.dom=(d.getElementById)?1:0;
	this.ns=(d.layers);
	this.ns4up=(this.ns && this.major >=4);
	this.ns6=(this.dom&&navigator.appName=="Netscape");
	this.op=(window.opera? 1:0);
	this.ie=(d.all);
	this.ie4=(d.all&&!this.dom)?1:0;
	this.ie4up=(this.ie && this.major >= 4);
	this.ie5=(d.all&&this.dom);
	this.win=((this.agt.indexOf("win")!=-1) || (this.agt.indexOf("16bit")!=-1));
	this.mac=(this.agt.indexOf("mac")!=-1);
};

var oBw = new ylib_Browser();

function ylib_getObj(id,d)
{
	var i,x;  if(!d) d=document; 
	if(!(x=d[id])&&d.all) x=d.all[id]; 
	for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][id];
	for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=ylib_getObj(id,d.layers[i].document);
	if(!x && document.getElementById) x=document.getElementById(id); 
	return x;
};

function ylib_getH(o) { return (oBw.ns)?((o.height)?o.height:o.clip.height):((oBw.op&&typeof o.style.pixelHeight!='undefined')?o.style.pixelHeight:o.offsetHeight); };
function ylib_setH(o,h) { if(o.clip) o.clip.height=h; else if(oBw.op && typeof o.style.pixelHeight != 'undefined') o.style.pixelHeight=h; else o.style.height=h; };
function ylib_getW(o) { return (oBw.ns)?((o.width)?o.width:o.clip.width):((oBw.op&&typeof o.style.pixelWidth!='undefined')?w=o.style.pixelWidth:o.offsetWidth); };
function ylib_setW(o,w) { if(o.clip) o.clip.width=w; else if(oBw.op && typeof o.style.pixelWidth != 'undefined') o.style.pixelWidth=w; else o.style.width=w; };
function ylib_getX(o) { return (oBw.ns)?o.left:((o.style.pixelLeft)?o.style.pixelLeft:o.offsetLeft); };
function ylib_setX(o,x) { if(oBw.ns) o.left=x; else if(typeof o.style.pixelLeft != 'undefined') o.style.pixelLeft=x; else o.style.left=x; };
function ylib_getY(o) { return (oBw.ns)?o.top:((o.style.pixelTop)?o.style.pixelTop:o.offsetTop); };
function ylib_setY(o,y) { if(oBw.ns) o.top=y; else if(typeof o.style.pixelTop != 'undefined') o.style.pixelTop=y; else o.style.top=y; };
function ylib_getPageX(o) { var x=0; if(oBw.ns) x=o.pageX; else { while(eval(o)) { x+=o.offsetLeft; o=o.offsetParent; } } return x; };
function ylib_getPageY(o) { var y=0; if(oBw.ns) y=o.pageY; else { while(eval(o)) { y+=o.offsetTop; o=o.offsetParent; } } return y; };
function ylib_getZ(o) { return (oBw.ns)?o.zIndex:o.style.zIndex; };
function ylib_moveTo(o,x,y) { ylib_setX(o,x);ylib_setY(o,y); };
function ylib_moveBy(o,x,y) { ylib_setX(o,ylib_getPageX(o)+x);ylib_setY(o,ylib_getPageY(o)+y); };
function ylib_setZ(o,z) { if(oBw.ns)o.zIndex=z;else o.style.zIndex=z; };
function ylib_show(o,disp) { (oBw.ns)? '':(!disp)? o.style.display="inline":o.style.display=disp; (oBw.ns)? o.visibility='show':o.style.visibility='visible'; };
function ylib_hide(o,disp) { (oBw.ns)? '':(arguments.length!=2)? o.style.display="none":o.style.display=disp; (oBw.ns)? o.visibility='hide':o.style.visibility='hidden'; };
function ylib_setStyle(o,s,v) { if(oBw.ie5||oBw.dom) eval("o.style."+s+" = '" + v +"'"); };
function ylib_getStyle(o,s) { if(oBw.ie5||oBw.dom) return eval("o.style."+s); };
function ylib_addEvt(o,e,f,c){ if(o.addEventListener)o.addEventListener(e,f,c);else if(o.attachEvent)o.attachEvent("on"+e,f);else eval("o.on"+e+"="+f) };
function ylib_writeHTML(o,h) { if(oBw.ns){var doc=o.document;doc.write(h);doc.close();return false;} if(o.innerHTML)o.innerHTML=h; };
function ylib2_hide(o,disp) { (oBw.ns)? '':(!disp)? o.style.display="inline":o.style.display=disp; (oBw.ns)? o.visibility='show':o.style.visibility='visible'; };
function ylib2_show(o,disp) { (oBw.ns)? '':(arguments.length!=2)? o.style.display="none":o.style.display=disp; (oBw.ns)? o.visibility='hide':o.style.visibility='hidden'; };

function ylib_insertHTML(o,h,w)
{
	if(oBw.op) return;
	if(o.insertAdjacentHTML)
	{ 
		o.insertAdjacentHTML(w,h);
		return;
	}
	if(oBw.ns)
	{
		ylib_writeHTML(o,h);
		return;
	}
	var r = o.ownerDocument.createRange();
	r.setStartBefore(o);
	var frag = r.createContextualFragment(h);
	ylib_insertObj(o,w,frag);
};

function ylib_insertObj(o,w,node)
{
	switch(w)
	{
		case 'beforeBegin':
			o.parentNode.insertBefore(node,o);
		break;

		case 'afterBegin':
			o.insertBefore(node,o.firstChild);
		break;

		case 'beforeEnd':
			o.appendChild(node);
		break;

		case 'afterEnd':
			if (o.nextSibling) o.parentNode.insertBefore(node,o.nextSibling);
			else o.parentNode.appendChild(node);
		break;
	}
};

function addEvent( obj, evType, fn, useCapture )
{
    if ( obj.addEventListener ) {
        obj.addEventListener( evType, fn, useCapture );
        return true;
    }
    
    if ( obj.attachEvent ) {
        return obj.attachEvent( "on" + evType, fn );
    }
    
    alert( "Unable to add event listener for " + evType + " to " + obj.tagName );
}

function removeEvent( obj, evType, fn, useCapture )
{
    if ( obj.removeEventListener ) {
        obj.removeEventListener( evType, fn, useCapture );
        return true;
    }
    if ( obj.detachEvent ) {
        return obj.detachEvent( "on" + evType, fn );
    }
    
    alert( "Unable to remove event listener for " + evType + " from " + obj.tagName );
}
// ---------- Style sheet utilities