Hi, I am new to JS. Long time passed trying to understand JS basics and functions...may be it's time for asking some help.
Om my exam pages I have <iframe> and <img> to change pages in the iframe. I have links to other 5 pages that are opened in the <iframe>. I decide to coppy all my files to 2 directories: "english" and "bulgarian" and to create a function wich search URL of the iframe.
IE7, Maxthon and Opera handle it well and alter my last page in the iframe, but Firefox not. Here is my code:

function changeLang() // related to <img ... lang_btn & lang_btn_f2 onclick event .. change content in <iframe> element
{
var agt=navigator.userAgent.toLowerCase();           // 1 st part of function is trying to determine if browser is Firefox (because of problems when loaded with firefox)
if (agt.indexOf("firefox") != -1)                    
{ 
var add = document.getElementById('content').src;
if (add.indexOf("english") != -1)
{
add = add.replace("english","bulgarian");
document.getElementById('content').src = add;
}
else if (add.indexOf("bulgarian") != -1)
{
add = add.replace("bulgarian","english");
document.getElementById('content').src = add;       
}
}
// end of firefox code block
else     
{

var add = frames['content'].location.href;   //second part of code that works fine with IE, Maxthon and Opera
if (add.indexOf("english") != -1)
{
add = add.replace("english","bulgarian");
frames['content'].location.href = add;
}
else if (add.indexOf("bulgarian") != -1)
{
add = add.replace("bulgarian","english");
frames['content'].location.href = add;      
}
}
}  //end  of changeLang() function


function roll_over(action, img_name, img_src, cursor)   // this function handles altering images for appropriate page languages and mouse events
   {
   
   var agt=navigator.userAgent.toLowerCase();  // part 1 : firefox
   if (agt.indexOf("firefox") != -1)
   {
   var add = document.getElementById('content').src;

   if (add.indexOf("english") != -1)
   {
	if(action == "over")
	{
	img_src = "images/lang_btn.jpg";
	}
	if(action == "out")
	{
	img_src = "images/lang_btn_f2.jpg";
	}
   }
   else if (add.indexOf("bulgarian") != -1)
   {
	if(action == "over")
	{
	img_src = "images/lang_btn_f2.jpg";
	}
	if(action == "out")
	{
	img_src = "images/lang_btn.jpg";
	}
   }
   document[img_name].src = img_src;
   document.getElementById(img_name).style.cursor = cursor;
   }       //end of firefox part
   
   else
   {
   var add = frames['content'].location.href;   //part 2 - works with IE, Maxthon and Opera 
   if (add.indexOf("english") != -1)
   {
	if(action == "over")
	{
	img_src = "images/lang_btn.jpg";
	}
	if(action == "out")
	{
	img_src = "images/lang_btn_f2.jpg";
	}
   }
   else if (add.indexOf("bulgarian") != -1)
   {
	if(action == "over")
	{
	img_src = "images/lang_btn_f2.jpg";
	}
	if(action == "out")
	{
	img_src = "images/lang_btn.jpg";
	}
   }
   document[img_name].src = img_src;
   document.getElementById(img_name).style.cursor = cursor;
   }
   }  // script ends here

I'm sure that doing something wrong but don't know where my misstakes are especially about Firefox. Excuse me for the long code, but my experience is really poor.

Ok, it's solved - because of security reasons I can not use frames.location.href . Only can get source of <iframe> wich is static and always the same, but not current URL of the iframe. This make my code useless and entire correction of the site is necessary.

This question has already been answered. Start a new discussion instead.