var col_1 = new String();
var col_2 = new String();
var x=1;
 
base_link_color = "rgb(255,240,217)";
dim_link_color = "rgb(239,232,209)";

function flicker()
{
 if(x%2) 
 {
  col_1 = base_link_color;
  col_2 = dim_link_color;
 }else
 {
  col_1 = dim_link_color;
  col_2 = base_link_color;
 }
 
document.getElementById('aF').style.color=col_1;
document.getElementById('bF').style.color=col_2;
document.getElementById('cF').style.color=col_1;

 x++;
 
 if(x>2){x=1};
 
 setTimeout("flicker()",300);
}