function doit(header1,header2,header3){

	var head1=document.all[header1].style
		head2=document.all[header2].style
		head3=document.all[header3].style

		if (head1.display=="none")
		head1.display=""
	    else
		head1.display="none"

		if (head2.display=="none")
		head2.display=""
	    else
		head2.display="none"

		if (head3.display=="none")
		head3.display=""
	    else
		head3.display="none"

}
function donav(header){

	var head=document.all[header].style

		if (head.display=="none")
		head.display=""
	    else
		head.display="none"

}