function display_block1() {
		document.getElementById('1').style.display = "block";
	}
        
	function display_block2() {
		document.getElementById('2').style.display = "block";
	}

        function display_block3() {
		document.getElementById('3').style.display = "block";
	}

        function display_block4() {
		document.getElementById('4').style.display = "block";
	}

        function display_block5() {
		document.getElementById('5').style.display = "block";
	}

        function display_block6() {
		document.getElementById('6').style.display = "block";
	}

        function display_block7() {
		document.getElementById('7').style.display = "block";
	}

        function display_block8() {
		document.getElementById('8').style.display = "block";
	}





        function hide_block1() {
		document.getElementById('1').style.display = "none";
	}
        
	function hide_block2() {
		document.getElementById('2').style.display = "none";
	}
        
        function hide_block3() {
		document.getElementById('3').style.display = "none";
	}

        function hide_block4() {
		document.getElementById('4').style.display = "none";
	}
        
        function hide_block5() {
		document.getElementById('5').style.display = "none";
	}

        function hide_block6() {
		document.getElementById('6').style.display = "none";
	}

        function hide_block7() {
		document.getElementById('7').style.display = "none";
	}
	
        function hide_block8() {
		document.getElementById('8').style.display = "none";
	}