function on(theButton){
    document.getElementById(theButton).src = "/images/menus/" + theButton + "_on.gif"
}

function off(theButton){
    document.getElementById(theButton).src = "/images/menus/" + theButton + ".gif"
}

function doExternalLink(){  
    if (!document.getElementsByTagName) return;  
    var anchors = document.getElementsByTagName("a");  
    for (var i=0; i<anchors.length; i++) {  
        var anchor = anchors[i];  
        if (anchor.getAttribute("href") &&  
            anchor.getAttribute("rel") == "external")  
            anchor.target = "_blank";  
    }  
}  

window.onload = doExternalLink;

aboutUsOn = new Image(); 
aboutUsOn.src = "/images/menus/About-Us_on.gif";
servicesOn = new Image(); 
servicesOn.src = "/images/menus/Services_on.gif";
beforeAndAfterOn = new Image(); 
beforeAndAfterOn.src = "/images/menus/Before-After-Photos_on.gif";
patientEducationOn = new Image(); 
patientEducationOn.src = "/images/menus/Patient-Education_on.gif";
patientCenterOn = new Image(); 
patientCenterOn.src = "/images/menus/Patient-Center_on.gif";
productsOn = new Image(); 
productsOn.src = "/images/menus/Products_on.gif";
newsEventsOn = new Image(); 
newsEventsOn.src = "/images/menus/News-Events_on.gif";
contactUsOn = new Image(); 
contactUsOn.src = "/images/menus/Contact-Us_on.gif";

aboutUsOff = new Image(); 
aboutUsOff.src = "/images/menus/About-Us.gif";
servicesOff = new Image(); 
servicesOff.src = "/images/menus/Services.gif";
beforeAndAfterOff = new Image(); 
beforeAndAfterOff.src = "/images/menus/Before-After-Photos.gif";
patientEducationOff = new Image(); 
patientEducationOff.src = "/images/menus/Patient-Education.gif";
patientCenterOff = new Image(); 
patientCenterOff.src = "/images/menus/Patient-Center.gif";
productsOff = new Image(); 
productsOff.src = "/images/menus/Products.gif";
newsEventsOff = new Image(); 
newsEventsOff.src = "/images/menus/News-Events.gif";
contactUsOff = new Image(); 
contactUsOff.src = "/images/menus/Contact-Us.gif";