function toggle() { 
	var pattern1e=/\/en\//g 
	var pattern1f=/\/fr\//g
	var here=location.href
	if (pattern1e.test(here)) {
		here=here.replace(pattern1e, "/fr/")   
		} 
		else    {    
		if (pattern1f.test(here))  
		here=here.replace(pattern1f, "/en/")
		} 
		location.href=here
		}