function showTbl1() {
		document.getElementById('table1').style.display='block';
		document.getElementById('table2').style.display='none';
		document.getElementById('table3').style.display='none';
		document.getElementById('table4').style.display='none';
		document.getElementById('menu1').src='/images/menu__b1_over.png';
		document.getElementById('menu2').src='/images/menu__b2.png';
		document.getElementById('menu3').src='/images/menu__b3.png';
		document.getElementById('menu4').src='/images/menu__b4.png';
	}
	function showTbl2() {
		document.getElementById('table1').style.display='none';
		document.getElementById('table2').style.display='block';
		document.getElementById('table3').style.display='none';
		document.getElementById('table4').style.display='none';
		document.getElementById('menu1').src='/images/menu__b1.png';
		document.getElementById('menu2').src='/images/menu__b2_over.png';
		document.getElementById('menu3').src='/images/menu__b3.png';
		document.getElementById('menu4').src='/images/menu__b4.png';
	}
	function showTbl3() {
		document.getElementById('table1').style.display='none';
		document.getElementById('table2').style.display='none';
		document.getElementById('table3').style.display='block';
		document.getElementById('table4').style.display='none';
		document.getElementById('menu1').src='/images/menu__b1.png';
		document.getElementById('menu2').src='/images/menu__b2.png';
		document.getElementById('menu3').src='/images/menu__b3_over.png';
		document.getElementById('menu4').src='/images/menu__b4.png';
	}
	function showTbl4() {
		document.getElementById('table1').style.display='none';
		document.getElementById('table2').style.display='none';
		document.getElementById('table3').style.display='none';
		document.getElementById('table4').style.display='block';
		document.getElementById('menu1').src='/images/menu__b1.png';
		document.getElementById('menu2').src='/images/menu__b2.png';
		document.getElementById('menu3').src='/images/menu__b3.png';
		document.getElementById('menu4').src='/images/menu__b4_over.png';
	}
	function showOver1() {
		if (document.getElementById('table1').style.display=='block') {
			document.getElementById('menu1').src='/images/menu__b1_over.png';
		} else {
			document.getElementById('menu1').src='/images/menu__b1.png';
		}
	}
	function showOver2() {
		if (document.getElementById('table2').style.display=='block') {
			document.getElementById('menu2').src='/images/menu__b2_over.png';
		} else {
			document.getElementById('menu2').src='/images/menu__b2.png';
		}
	}
	function showOver3() {
		if (document.getElementById('table3').style.display=='block') {
			document.getElementById('menu3').src='/images/menu__b3_over.png';
		} else {
			document.getElementById('menu3').src='/images/menu__b3.png';
		}
	}
	function showOver4() {
		if (document.getElementById('table4').style.display=='block') {
			document.getElementById('menu4').src='/images/menu__b4_over.png';
		} else {
			document.getElementById('menu4').src='/images/menu__b4.png';
		}
	}
	function showTW() {
		if (document.getElementById('twWPMDiv').style.display=='none') {
			document.getElementById('twWPMDiv').style.display='inline';
		} else {
			document.getElementById('twWPMDiv').style.display='none';
		}
	}
	function showSH() {
		if (document.getElementById('shWPMDiv').style.display=='none') {
			document.getElementById('shWPMDiv').style.display='inline';
		} else {
			document.getElementById('shWPMDiv').style.display='none';
		}
	}