function mouseover1()
{
  document.getElementById("navalt1").src="images/tc_header_3_ovr.gif";
}
function mouseover2()
{
  document.getElementById("navalt2").src="images/tc_header_4_ovr.gif";
}
function mouseover3()
{
  document.getElementById("navalt3").src="images/tc_header_5_ovr.gif";
}
function mouseout1()
{
  document.getElementById("navalt1").src="images/tc_header_3.gif";
}
function mouseout2()
{
  document.getElementById("navalt2").src="images/tc_header_4.gif";
}
function mouseout3()
{
  document.getElementById("navalt3").src="images/tc_header_5.gif";
}

var links = document.getElementById('nav').getElementsByTagName('a');
for ( var i = 0; i < links.length; i++ ) {
    links[i].onmousedown = function () {
        this.blur();
        return false;
    }
    links[i].onclick = function() {
        this.blur();
    }
    if ( /msie/i.test(navigator.userAgent) && !/opera/i.test(navigator.userAgent) ) {
        links[i].onfocus = function() {
            this.blur();
        }
    }
}