function semi()
{	
	semicon.style.display="list-item";
	diag.style.display="none";
	produ.style.display="none";
	educa.style.display="none";
}
function repadiag()
{	
	semicon.style.display="none";
	diag.style.display="list-item";
	produ.style.display="none";
	educa.style.display="none";
}
function prod()
{	
	semicon.style.display="none";
	diag.style.display="none";
	produ.style.display="list-item"
	educa.style.display="none";
}
function edu()
{	
	semicon.style.display="none";
	diag.style.display="none";
	produ.style.display="none";
	educa.style.display="list-item";
}