//
// Object name: RollOver
//
// Author: Eric Byrnes, Hybridigital
//
// Parameters: OffSrc - relative path to 'Off' image
//             OnSrc - relative path to 'On' image
//
// Usage: 1) include the Javascript source file within the HTML header, i.e.
//           <SCRIPT LANGUAGE="Javascript" SRC="../rollover.js">
//
//        2) create new Rollover objects for each rollover, passing the source for
//           the 'Off' image and 'On' image, i.e.
//           rollimage = new RollOver("/images/OffImage.gif","/images/OnImage.gif");
//
//        3) call it within the HTML
//           <A HREF="xxx" onMouseOver="rollimage.On('target')" onMouseOut="rollimage.Off('target')">
//           <IMG NAME="target" SRC="<default>"></A>
//           where
//           - rollimage is the object created in step 2
//           - target is either the image object or the name of the image object to
//             apply the rollover to
//
// Attributes: state - OFF or ON
// Methods: On(target) - turns object 'on' (overlays image named target with 'On' image)
//          Off(target) - turns object 'off' (overlays image named target with 'Off' image)
//          Toggle(target) - toggles object state for image named target
//
// Modification Log
// ERB  20-OCT-1999  Initial release.
// ERB  08-NOV-9999  Updated for Netscape compatibility
// ERB  08-FEB-2000  Updated for Netscape 3.x compatibility

//
// Method functions for Rollover object below
function RollOverOn(target) {

	if (document.images) {
		if (typeof (target) == "string") {
			if (typeof (eval(document[target])) == "object") {
				document[target].src = this.OnImage.src;
			}
		} else if (typeof (target) == "object") {
			target.src = this.OnImage.src;
		}
	}
	this.State = "ON";
}

function RollOverOff(target) {

	if (document.images) {
		if (typeof (target) == "string") {
			if (typeof (eval(document[target])) == "object") {
				document[target].src = this.OffImage.src;
			}
		} else if (typeof (target) == "object") {
			target.src = this.OffImage.src;
		}
	}
	this.State = "OFF";
}

function RollOverToggle(target) {

	// change state attribute
	if (this.State == "OFF")
		this.On(target)
	else
		this.Off(target);
}

// MAIN RollOver object
function RollOver(OffSrc, OnSrc) {

	if (document.images) {
		// create on object for the 'Off' state
		this.OffImage = new Image();
		// initialize 'off' property object
		this.OffImage.src = OffSrc;

		// create on object for the 'On' state
		this.OnImage = new Image();
		// initialize 'on' property object
		this.OnImage.src = OnSrc;
	}

	// initialize attributes
	this.State = "OFF";

	// set up methods for 'On', 'Off', and 'Toggle'
	this.Off = RollOverOff;
	this.On = RollOverOn;
	this.Toggle = RollOverToggle;
}