function show1() {
if (document.getElementById("subject1").style.display == "none"){
document.getElementById("subject1").style.display="block";
} else {
document.getElementById("subject1").style.display="none";

}
}

function show2() {
if (document.getElementById("subject2").style.display == "none"){
document.getElementById("subject2").style.display="block";
} else {
document.getElementById("subject2").style.display="none";

}
}

function show3() {
if (document.getElementById("subject3").style.display == "none"){
document.getElementById("subject3").style.display="block";
} else {
document.getElementById("subject3").style.display="none";

}
}

function popvideo() {
	window.open('../video/speed.html','','width=322,height=290,menubar=no,status=no,location=no,toolbar=no,scrollbars=no,resizable=no');
	}

function popvideo1(x,y) {
	window.open(x,'',y);
}