// Navigation Menu Functions
var cellHighLightColour = "#FFCF31";
var cellBaseColour = "#0054E3";
var textHighLightColour = "#000000";
var textBaseColour = "#FFFFFF";
function showmenu(elmnt){document.getElementById(elmnt).style.visibility="visible";document.getElementById(elmnt).style.color=textHighLightColour;}
function hidemenu(elmnt){document.getElementById(elmnt).style.visibility="hidden";document.getElementById(elmnt).style.color=textBaseColour;}
function colourCell(elmnt){document.getElementById(elmnt).style.backgroundColor=cellHighLightColour;}
function unColourCell(elmnt){document.getElementById(elmnt).style.backgroundColor=cellBaseColour;}