leftNav1_off = new Image(); 
leftNav2_off = new Image(); 
leftNav3_off = new Image(); 
leftNav4_off = new Image(); 
leftNav5_off = new Image();
leftNav6_off = new Image();
leftNav1_over = new Image(); 
leftNav2_over = new Image(); 
leftNav3_over = new Image(); 
leftNav4_over = new Image(); 
leftNav5_over = new Image(); 
leftNav6_over = new Image(); 
leftNav1_off.src = "images/n_understanding1.gif";
leftNav2_off.src = "images/n_risk1.gif";
leftNav3_off.src = "images/n_about1.gif";
leftNav4_off.src = "images/n_tools1.gif";
leftNav5_off.src = "images/n_safety1.gif";
leftNav6_off.src = "images/n_learnMore1.gif";
leftNav1_over.src = "images/n_understanding2.gif";
leftNav2_over.src = "images/n_risk2.gif";
leftNav3_over.src = "images/n_about2.gif";
leftNav4_over.src = "images/n_tools2.gif";
leftNav5_over.src = "images/n_safety2.gif";
leftNav6_over.src = "images/n_learnMore2.gif";

function button_on(imgID) {
  if (document.images) {
    document.getElementById(imgID).src = eval(imgID + "_over.src");
  }
}
function button_off(imgID) {
  if (document.images) {
    document.getElementById(imgID).src = eval(imgID + "_off.src");
  }
}

function printPage() {
  print();
}

function ts( inc ) {
  if (!document.getElementsByTagName)
      return;
  
  var base    = new Array( '10px', '12px', '15px');
  var subh    = new Array( '12px', '14px', '17px');
  var head    = new Array( '18px', '20px', '22px');
  var isi     = new Array( '9px',  '10px', '11px');
  var sdbr    = new Array( '10px', '11px', '14px');
  var sdbrlh  = new Array( '12px', '15px', '18px');
  var sdbrsh  = new Array( '12px', '13px', '17px');

  var startSz = 1, cookNM = "tsize=", i, j, cTags, sz;
  var pos     = document.cookie.indexOf(cookNM);

  if (pos != -1)
  {
      pos = pos + cookNM.length;
      startSz = unescape(document.cookie.substring(pos, pos+1));
  } else {
      document.cookie = cookNM + escape("1");    
  }

  sz = parseInt(startSz) + parseInt(inc);
  
  if (( sz < 0 ) || ( sz > 2 ))
      return;
  
  document.cookie = cookNM + escape(sz) ; 

  cTags = document.getElementsByTagName("*"); 
  
  for ( j = 0 ; j < cTags.length ; j++ )
  {
    i = cTags[ j ];
    if (i.getAttribute("name") == "base") 
      cTags[ j ].style.fontSize = base[ sz ];
    else if (i.getAttribute("name") == "subhead") 
      cTags[ j ].style.fontSize = subh[ sz ]; 
    else if (i.getAttribute("name") == "header") 
      cTags[ j ].style.fontSize = head[ sz ]; 
    else if (i.getAttribute("name") == "isi") 
      cTags[ j ].style.fontSize = isi[ sz ]; 
    else if (i.getAttribute("name") == "sidebar") {
      cTags[ j ].style.fontSize = sdbr[ sz ]; 
      cTags[ j ].style.lineHeight = sdbrlh[ sz ];
    } else if (i.getAttribute("name") == "sidebarsubhead") 
      cTags[ j ].style.fontSize = sdbrsh[ sz ]; 
  }
}