function rolloverOn(imageName){
  if(document.images){
    document[imageName].src="images/" + imageName + "_hi.gif";
  }
}

function rolloverOff(imageName){
  if(document.images){
    document[imageName].src="images/" + imageName + ".gif";
  }
}

function rolloverTxtOn(imageName){
  if(document.images){
    document[imageName].src="images/" + imageName + "_hi.gif";
    document.infoPanel.src="images/info_" + imageName + ".gif";
  }
}

function rolloverTxtOff(imageName){
  if(document.images){
    document[imageName].src="images/" + imageName + ".gif";
    document.infoPanel.src="images/info_select.gif";
  }
}

function rolloverClick(imageName){
  if(document.images){
    document[imageName].src="images/" + imageName + ".gif";
    document.infoPanel.src="images/info_blank.gif";
  }
}