function toggleVisibility(id, NNtype, IEtype, WC3type) {
    if (document.getElementById) {
        eval("document.getElementById(id).style.visibility = \"" + WC3type + "\"");
    } else {
        if (document.layers) {
            document.layers[id].visibility = NNtype;
        } else {
            if (document.all) {
                eval("document.all." + id + ".style.visibility = \"" + IEtype + "\"");
            }
        }
    }
}
function toggleDisplay(id, NNtype, IEtype, WC3type) {
    if (document.getElementById) {
        eval("document.getElementById(id).style.display = \"" + WC3type + "\"");
    } else {
        if (document.layers) {
            document.layers[id].display = NNtype;
        } else {
            if (document.all) {
                eval("document.all." + id + ".style.display = \"" + IEtype + "\"");
            }
        }
    }
}

function activate(image_name) {
	if (document.images) {
		document[image_name].src = eval(image_name + "On.src");
	}
}
function deactivate(image_name) {
	if (document.images) {
		document[image_name].src = eval(image_name + "Off.src");
	}
}

function showCity(city) {
	if (city == 'Allen') {
		toggleVisibility('Allen','show','visible','visible');
		toggleDisplay('Allen','block','block','block');
		toggleVisibility('Plano','hidden','hidden','hidden');
		toggleDisplay('Plano','none','none','none');			
	}
	else {
		toggleVisibility('Plano','show','visible','visible');
		toggleDisplay('Plano','block','block','block');
		toggleVisibility('Allen','hidden','hidden','hidden');
		toggleDisplay('Allen','none','none','none');			
	}
}

function showCity1(city) {
	if (city == 'Dallas') {
		toggleVisibility('Dallas','show','visible','visible');
		toggleDisplay('Dallas','block','block','block');
		toggleVisibility('BuccamentBay','hidden','hidden','hidden');
		toggleDisplay('BuccamentBay','none','none','none');			
	}
	else {
		toggleVisibility('BuccamentBay','show','visible','visible');
		toggleDisplay('BuccamentBay','block','block','block');
		toggleVisibility('Dallas','hidden','hidden','hidden');
		toggleDisplay('Dallas','none','none','none');			
	}
}

function toggleDiv(showdiv, numimages) {
	var currentdiv = "div1";
	var i = 1;
	for (i=1;i<=numimages;i++) {
		currentdiv = "div" + i;
		if (currentdiv == showdiv) {
			toggleVisibility(showdiv,'show','visible','visible');
			toggleDisplay(showdiv,'block','block','block');
		}
		else {
			toggleVisibility(currentdiv,'hidden','hidden','hidden');
			toggleDisplay(currentdiv,'none','none','none');			
		}
	}
}