function framer()
{
    try {
	if (top.frames.length > 0) {;
		if (top.location == self.location || top.location.href.substring(0,32) != self.location.href.substring(0,32)) top.location = "index.html";
		}
        } catch (e) {
		top.location = "index.html";
        	}

} 

function mid_frame()
{
    try {
	if (top.location == self.location || top.location.href.substring(0,32) != self.location.href.substring(0,32)) top.location = "index.html";
        } catch (e) {
		top.location = "index.html";
        	}

} 

function top_frame()
{ 
    try {
	if (top != self.parent || top.frames.length == 0) 
	top.location = top.location = "index.html"; 
        } catch (e) {
		top.location = "index.html";
        	}
}

function backButton()
{ 
    try {
	if (top.frames.length == 0)
	window.document.write('<a href="index.html"><img src="images/button_back.gif" border=0 alt=""/></a>');
	} catch (e) {}
}