if word found play macro - if-statement

Question

var ret;
while (ret=1) {
ret = iimPlay("macro.iim");
if (ret == -921)
iimPlay("macro2.iim");
}
it works amazing but sometimes the session ends but I don't know exactly how much the session last, do you know if there is a way to login if you are in "specific url" or something like that?
RuntimeError: element IMG specified by WIDTH:100 was not found, line 20(-921)"
as you can see I'm already using -921 to do another macro but is there any way to do something if that specific tag is not found?
Maybe a new js file can be created and it will be my new "macro2" with something like this "if word is found play macro3 if not play oldmacro2""

Answer 1

Whenever I test for a tag I usually extract some part of it and test the extracted text for "#EANF#". If the tag is not found you will get the string "#EANF#" and you can route your program to do something else. Here is an example:
var macro, returnCode;
macro="CODE: ";
macro+="URL GOTO=http://www.google.com/\n";
macro+="TAG POS=1 TYPE=BUTTON FORM=ID:gbqf ATTR=ID:gbqfba EXTRACT=TXT\n";
returnCode = iimPlay(macro);
lastExtract = iimGetLastExtract();
if (lastExtract.localeCompare("#EANF#") !== 0)
{
alert("Tag Found");
} else
{
alert("Tag not found");
}
macro="CODE: ";
macro+="URL GOTO=http://www.google.com/\n";
macro+="TAG POS=1 TYPE=BUTTON FORM=ID:gbf ATTR=ID:gbqfba EXTRACT=TXT\n";
returnCode = iimPlay(macro);
lastExtract = iimGetLastExtract();
if (lastExtract.localeCompare("#EANF#") !== 0)
{
alert("Tag Found");
} else
{
alert("Tag not found");
}