function btn_mouseover(intBtnNo)
{
	switch(intBtnNo)
	{
		case 1:
			document.btn1.src="Images/Buttons/Home_down.png"
			break
		case 2:
			document.btn2.src="Images/Buttons/News_down.png"
			break
		case 3:
			document.btn3.src="Images/Buttons/Research_down.png"
			break
		case 4:
			document.btn4.src="Images/Buttons/Publications_down.png"
			break
		case 5:
			document.btn5.src="Images/Buttons/People_down.png"
			break
		case 6:
			document.btn6.src="Images/Buttons/Courses_down.png"
			break
		case 7:
			document.btn7.src="Images/Buttons/Links_down.png"
			break
		case 8:
			document.btn8.src="Images/Buttons/Demos_down.png"
			break
		case 9:
			document.btn9.src="Images/Buttons/Contact_down.png"
			break
	}
}

function btn_mouseout(intBtnNo)
{
	switch(intBtnNo)
	{
		case 1:
			document.btn1.src="Images/Buttons/Home.png"
			break
		case 2:
			document.btn2.src="Images/Buttons/News.png"
			break
		case 3:
			document.btn3.src="Images/Buttons/Research.png"
			break
		case 4:
			document.btn4.src="Images/Buttons/Publications.png"
			break
		case 5:
			document.btn5.src="Images/Buttons/People.png"
			break
		case 6:
			document.btn6.src="Images/Buttons/Courses.png"
			break
		case 7:
			document.btn7.src="Images/Buttons/Links.png"
			break
		case 8:
			document.btn8.src="Images/Buttons/Demos.png"
			break
		case 9:
			document.btn9.src="Images/Buttons/Contact.png"
			break
	}
}