// Menu Item: Home
var image1 = new Image(); image1.src = './images/education_normal.gif';
var image2 = new Image(); image2.src = './images/education_hover.gif';

// Menu Item: Database
var image4 = new Image(); image4.src = './images/questions_normal.gif';
var image5 = new Image(); image5.src = './images/questions_hover.gif';

// Menu Item: Education
var image7 = new Image(); image7.src = './images/about_normal.gif';
var image8 = new Image(); image8.src = './images/about_hover.gif';

// Menu Item:  Faq
var image10 = new Image(); image10.src = './images/database_normal.gif';
var image11 = new Image(); image11.src = './images/database_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, Home hover
				document['btn_education'].src=image2.src;
				break;

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

				case "twoOn":
				//Turn on rollover images, Database hover
				document['btn_questions'].src=image5.src;
				break;

				case "twoOff":
				//Turn off rollover images, Database normal
				document['btn_questions'].src=image4.src;
				break;

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

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

				case "fourOn":
				//Turn on rollover images, faq hover
				document['btn_database'].src=image11.src;
				break;

				case "fourOff":
				//Turn off rollover images, faq normal
				document['btn_database'].src=image10.src;
				break;
			}
}