window.onload = function() {
	var box1 = document.getElementById('box1');	
	var box2 = document.getElementById('box2');	
	var box3 = document.getElementById('box3');	
	
	box1.style.display = "block";
	box2.style.display = "none";
	box3.style.display = "none";
}

function selecttab(tabon,taboff1,taboff2) {
	/* Obtain reference for the selected content IDs */
	var val1 = tabon;
	var val2 = taboff1;
	var val3 = taboff2;
	
	var boxShow = document.getElementById("box"+val1);
	
	var boxHideID1 = document.getElementById("box"+val2);
	
	var boxHideID2 = document.getElementById("box"+val3);
	
		
	/*show selected tab area*/
	boxShow.style.display = "block";

	/*hide other tab areas*/
	boxHideID1.style.display = "none";
	
	boxHideID2.style.display = "none";
	
}