// Menu Item: Learning Center
var image1 = new Image(); image1.src = 'images/bedu_normal.gif';
var image2 = new Image(); image2.src = 'images/bedu_hover.gif';

// Menu Item: Q&A
var image3 = new Image(); image3.src = 'images/bqa_normal.gif';
var image4 = new Image(); image4.src = 'images/bqa_hover.gif';

// Menu Item: Database
var image5 = new Image(); image5.src = 'images/bcrop_normal.gif';
var image6 = new Image(); image6.src = 'images/bcrop_hover.gif';

// Menu Item: AboutUs 
var image7 = new Image(); image7.src = 'images/babout_normal.gif';
var image8 = new Image(); image8.src = 'images/babout_hover.gif';

// Menu Item: back
var image9 = new Image(); image9.src = 'images/back_normal.gif';
var image10 = new Image(); image10.src = 'images/back_hover.gif';

fValidVer = 
  (((navigator.appName == "Netscape") && 
  (parseInt(navigator.appVersion) >= 3 )) || 
  ((navigator.appName == "Microsoft Internet Explorer") && 
  (parseInt(navigator.appVersion) >= 4 )));

function doRoll(which){
		switch(which){
				case "oneOn":
				//Turn on rollover images, Edu hover
				document['btn_edu'].src = image2.src;
				break;

				case "oneOff":
				//Turn off rollover images, Edu normal
				document['btn_edu'].src=image1.src;
				break;

				case "twoOn":
				//Turn on rollover images, Q&A hover
				document['btn_qa'].src=image4.src;
				break;

				case "twoOff":
				//Turn off rollover images, Q&A normal
				document['btn_qa'].src=image3.src;
				break;

				case "threeOn":
				//Turn on rollover images, DB hover
				document['btn_crop'].src=image6.src;
				break;

				case "threeOff":
				//Turn off rollover images, DB normal
				document['btn_crop'].src=image5.src;
				break;

				case "fourOn":
				//Turn on rollover images, About hover
				document['btn_about'].src=image8.src;
				break;

				case "fourOff":
				//Turn off rollover images, Events normal
				document['btn_about'].src=image7.src;
				break;

                case "fiveOn":
				//Turn on rollover images, About hover
				document['btn_back'].src=image10.src;
				break;

				case "fiveOff":
				//Turn off rollover images, Events normal
				document['btn_back'].src=image9.src;
				break;
			}
}