function iframe_src() 
{ 
var locsubstr = location.search.substring(1);//find url parameter 

if((locsubstr.indexOf("changeme")!= -1))//if there is a new path for changeme 
{ 
var changemeloc = locsubstr.substring(locsubstr.indexOf("=") + 1, locsubstr.length);//find the newpath for changeme 
parent.frames[0].location.replace(changemeloc);//change changeme to new path 
} 
else 
{parent.frames[0].location.replace(defaultpath);}//if there isn't a new path, set changeme to default 
}