function mouseOver1() { document.getElementById("m1").src ="images/intro_g_mbtn.jpg"; }
function mouseOut1()  { document.getElementById("m1").src ="images/intro_b_mbtn.jpg"; }
function mouseOver2() { document.getElementById("m2").src ="images/demo_g_mbtn.jpg"; }
function mouseOut2()  { document.getElementById("m2").src ="images/demo_b_mbtn.jpg"; }
function mouseOver3() { document.getElementById("m3").src ="images/format_g_mbtn.jpg"; }
function mouseOut3()  { document.getElementById("m3").src ="images/format_b_mbtn.jpg"; }
function mouseOver4() { document.getElementById("m4").src ="images/quest_g_mbtn.jpg"; }
function mouseOut4()  { document.getElementById("m4").src ="images/quest_b_mbtn.jpg"; }
function mouseOver5() { document.getElementById("m5").src ="images/learn_g_mbtn.jpg"; }
function mouseOut5()  { document.getElementById("m5").src ="images/learn_b_mbtn.jpg"; }