/*
This is a cross-browser layer library. There are some important
restrictions. Layers should not be nested into other layers.
Putting layers into a table is also not recommended.
Library programmed by Sabah Karaali (Last modified: 03-15-2002)

Following functions are included:

Browser-Function:

	checkBrowser()				Determines browser in use

Layer-Functions:

	getlayer(divname) 			Returns object of layer
	getlayerstyle(divname)		   "	style of layer
	getlayertop(divname)		   "	top position of layer
	getlayerleft(divname)		   "	left position of layer
	getlayerheight(divname)		   "	height of layer
	getlayerwidth(divname)		   "	width of layer
	
	setlayertop (divname,pos)	Sets 	Y position of layer
	setlayerleft (divname,pos)	   " 	X position of layer
	setpos (divname,posx,posy)	   "	X & Y position of layer
	
	setvisible (divname)		Sets	Layer visible
	setinvisible (divname)		Sets	Layer invisible
	
Other-Functions:

	getwindowheight ()			Returns height of browser window
	getwindowwidth ()			   "	width of browser window
	
*/

////////// BROWSER-FUNCTION: ///////////

	function checkBrowser(){
		this.ver=navigator.appVersion
		this.dom=document.getElementById?1:0
		this.ie5=(this.ver.indexOf("MSIE 5")>-1 && this.dom)?1:0;
		this.ie4=(document.all && !this.dom)?1:0;
		this.ns5=(this.dom && parseInt(this.ver) >= 5) ?1:0;
		this.ns4=(document.layers && !this.dom)?1:0;
		this.ie4mac=this.ie4 && navigator.userAgent.indexOf("Mac")>-1
		this.ns4mac=this.ns4 && navigator.appVersion.indexOf("Mac")>-1
		this.ie5mac=this.ie5 && navigator.userAgent.indexOf("Mac")>-1
		this.ie55=(this.ver.indexOf("MSIE 5.5")>-1 && this.dom)?1:0; 
		this.ie6=(this.ver.indexOf("MSIE 6")>-1 && this.dom)?1:0; 

		this.bw=( this.dom ||  this.ie6 || this.ie5 || this.ie4 || this.ns4 || this.ns5 || this.ie5mac)
		return this;
	}
	bw = new checkBrowser();

////////// LAYER-FUNCTIONS: ///////////

	// Returns object of layer
	function getlayer(divname) {
		if(bw.dom) return document.getElementById(divname);
		if(bw.ie4) return document.all[divname];
		if(bw.ns4) return document[divname];
		return null;
	}

	// Returns style of layer
	function getlayerstyle(divname) {
		if(bw.dom || bw.ie4) {
			if (getlayer(divname)) {
				tmpObj = getlayer(divname);
				return tmpObj.style;
			}
		}
		if(bw.ns4) {
			if (getlayer(divname)) return getlayer(divname);
		}
		return null;
	}

	// Returns top position of layer
	function getlayertop(divname) {
		if(bw.dom) {
			if(bw.ns5) {
				if(getlayerstyle(divname)) {
					tmpObj = getlayerstyle(divname);
					return parseInt(tmpObj.top);
				}
			}
			else {
				if(getlayerstyle(divname)) {
				tmpObj = getlayerstyle(divname);
				return tmpObj.posTop;
				}
			}
		}
		if(bw.ie4) {
			if(getlayer(divname)) {
			tmpObj = getlayer(divname);
			return tmpObj.posTop;
			}
		}
		if(bw.ns4) {
			if(getlayer(divname)) {
			tmpObj = getlayer(divname);
			return tmpObj.top;
			}
		}
		return null;
	}
	
	// Returns left position of layer
	function getlayerleft(divname) {
		if(bw.dom) {
			if(bw.ns5) {
				if(getlayerstyle(divname)) {
				tmpObj = getlayerstyle(divname);
				return parseInt(tmpObj.left);
				}
			}
			else {
				if(getlayerstyle(divname)) {
				tmpObj = getlayerstyle(divname);
				return tmpObj.posLeft;
				}
			}
		}
		if(bw.ie4) {
			if(getlayer(divname)) {
			tmpObj = getlayer(divname);
			return tmpObj.posLeft;
			}
		}
		if(bw.ns4) {
			if(getlayer(divname)) {
			tmpObj = getlayer(divname);
			return tmpObj.left;
			}
		}
		return null;
	}
	
	// Returns height of layer
	function getlayerheight(divname) {
		if(bw.dom || bw.ie4) {
			if(getlayer(divname)) {
			tmpObj = getlayer(divname);
			return tmpObj.offsetHeight;
			}
		}
		if(bw.ns4) {
			if(getlayer(divname)) {
			tmpObj = getlayer(divname)
			return tmpObj.document.height;
			}
		}
		return null;
	}
	
	// Returns width of layer
	function getlayerwidth(divname) {
		if(bw.dom || bw.ie4) {
			if(getlayer(divname)) {
			tmpObj = getlayer(divname);
			return tmpObj.offsetWidth;
			}
		}
		if(bw.ns4) {
			if(getlayer(divname)) {
			tmpObj = getlayer(divname);
			return tmpObj.document.width;
			}
		}
		return null;
	}

	// Sets Y position of layer
	function setlayertop (divname,pos) {
        obj = getlayer(divname);
		if(bw.dom && bw.ns5) obj.style.top = pos;
		if(bw.dom && !bw.ns5) obj.style.posTop = pos;
		if(bw.ie4) obj.posTop=pos;
		if(bw.ns4) obj.pageY=pos;
	}

	// Sets X position of layer
	function setlayerleft (divname,pos) {
	    obj = getlayer(divname);
		if(bw.dom && bw.ns5) obj.style.left = pos;
		if(bw.dom && !bw.ns5) obj.style.posLeft = pos;
		if(bw.ie4) obj.posLeft=pos;
		if(bw.ns4) obj.pageX=pos;
	}

	// Sets X,Y position of layer
	function setpos (divname, posx,posy) {
		setlayerleft (divname,posx);
		setlayertop (divname,posy);
	}

	// Sets Layer visible
	function setvisible (divname) {
		if(getlayerstyle(divname)) {
			tmpObj = getlayerstyle(divname);
			tmpObj.visibility="visible";
		}
	}
	
	// Sets Layer invisible
	function setinvisible (divname) {
		if(getlayerstyle(divname)) {
			tmpObj = getlayerstyle(divname);
			tmpObj.visibility="hidden";
		}
	}

////////// OTHER-FUNCTIONS: ///////////

	//Returns height of browser window
	function getwindowheight () {
		if(bw.dom) {
			 windowheight= document.body.offsetHeight;
			 if( bw.ns5) windowheight= window.innerHeight;
		}
		if(bw.ie4) windowheight= document.body.offsetHeight;
		if(bw.ns4) windowheight= window.innerHeight;
		return windowheight;
	}
		
	//Returns width of browser window
	function getwindowwidth () {
		if(bw.dom) {
			 windowwidth= document.body.offsetWidth;
			 if( bw.ns5) windowwidth= window.innerWidth;
		}
		if(bw.ie4) windowwidth= document.body.offsetWidth;
		if(bw.ns4) windowwidth= window.innerWidth;
		return windowwidth;
	}