function toggleTabs(id){

        if (id == 'advantages'){

                document.getElementById('advantages_button').style.background="url(/images/gui/tab.on.png)";
                document.getElementById('advantages_button').style.borderBottomColor="#F3932E";
                document.getElementById('advantages_button').style.borderBottomWidth="2px";

                document.getElementById('capabilities_button').style.background="url(/images/gui/tab.off.png)";
                document.getElementById('capabilities_button').style.borderBottomColor="#999999";
                document.getElementById('capabilities_button').style.borderBottomWidth="2px";

				if (document.getElementById('specifications_button')){
	                document.getElementById('specifications_button').style.background="url(/images/gui/tab.off.png)";
	                document.getElementById('specifications_button').style.borderBottomColor="#999999";
	                document.getElementById('specifications_button').style.borderBottomWidth="2px";
				}

                document.getElementById('advantages').style.display="";
                document.getElementById('capabilities').style.display="none";
                if (document.getElementById('specifications')){
                	document.getElementById('specifications').style.display="none";
                }
        } 
	if (id == 'capabilities'){

                document.getElementById('advantages_button').style.background="url(/images/gui/tab.off.png)";
                document.getElementById('advantages_button').style.borderBottomColor="#999999";
                document.getElementById('advantages_button').style.borderBottomWidth="2px";

                document.getElementById('capabilities_button').style.background="url(/images/gui/tab.on.png)";
                document.getElementById('capabilities_button').style.borderBottomColor="#F3932E";
                document.getElementById('capabilities_button').style.borderBottomWidth="2px";

				if (document.getElementById('specifications_button')){
	                document.getElementById('specifications_button').style.background="url(/images/gui/tab.off.png)";
	                document.getElementById('specifications_button').style.borderBottomColor="#999999";
	                document.getElementById('specifications_button').style.borderBottomWidth="2px";
				}

                document.getElementById('advantages').style.display="none";
                document.getElementById('capabilities').style.display="";
                if (document.getElementById('specifications')){
                	document.getElementById('specifications').style.display="none";
                }

        }
        if (id == 'specifications'){

                document.getElementById('advantages_button').style.background="url(/images/gui/tab.off.png)";
                document.getElementById('advantages_button').style.borderBottomColor="#999999";
                document.getElementById('advantages_button').style.borderBottomWidth="2px";

                document.getElementById('specifications_button').style.background="url(/images/gui/tab.on.png)";
                document.getElementById('specifications_button').style.borderBottomColor="#F3932E";
                document.getElementById('specifications_button').style.borderBottomWidth="2px";

                document.getElementById('capabilities_button').style.background="url(/images/gui/tab.off.png)";
                document.getElementById('capabilities_button').style.borderBottomColor="#999999";
                document.getElementById('capabilities_button').style.borderBottomWidth="2px";

                document.getElementById('advantages').style.display="none";
                document.getElementById('capabilities').style.display="none";
                if (document.getElementById('specifications')){
                	document.getElementById('specifications').style.display="";
                }
        } 




        if (id == 'challenge'){

                document.getElementById('challenge_button').style.background="url(/images/gui/tab.wide.on.png)";
                document.getElementById('help_button').style.background="url(/images/gui/tab.wide.off.png)";
                document.getElementById('challenge_button').style.borderBottomColor="#F3932E";
                document.getElementById('help_button').style.borderBottomColor="#999999";

                document.getElementById('challenge_button').style.borderBottomWidth="2px";
                document.getElementById('help_button').style.borderBottomWidth="2px";

                document.getElementById('challenge').style.display="";
                document.getElementById('help').style.display="none";
        } 
        if (id == 'help'){

                document.getElementById('challenge_button').style.background="url(/images/gui/tab.wide.off.png)";
                document.getElementById('help_button').style.background="url(/images/gui/tab.wide.on.png)";

                document.getElementById('challenge_button').style.borderBottomColor="#999999";
                document.getElementById('help_button').style.borderBottomColor="#F3932E";

                document.getElementById('challenge_button').style.borderBottomWidth="2px";
                document.getElementById('help_button').style.borderBottomWidth="2px";

                document.getElementById('challenge').style.display="none";
                document.getElementById('help').style.display="";

        }




}