function mouseOver() {
   var enterMenu = document.getElementById("enter");
   var rMenu = document.getElementById("r");
   var enterColor = "rgb(255,255,255)"
   var rColor = "rgb(255,0,0)"
   
   enterMenu.style.color = enterColor;
   rMenu.style.color = rColor;
}

function mouseOut() {
   var enterMenu = document.getElementById("enter");
   var rMenu = document.getElementById("r");
   var enterColor = "rgb(64,64,64)"
   
   enterMenu.style.color = enterColor;
   rMenu.style.color = enterColor;
}

function assignHandlers() {
   var enterElem = document.getElementById("enter");
   var rElem = document.getElementById("r");
   
   enterElem.onmouseover = mouseOver;
   enterElem.onmouseout = mouseOut;
   rElem.onmouseover = mouseOver;
   rElem.onmouseout = mouseOut;
}

window.onload = function() {
   assignHandlers();
}