<script> generate tag using createElement IE issue

I am running some javascript that i include on the page using script include and within this script I generate another script tag that references a dynamic php file that returns javascript.

The javascript that is returned is a json object that i use in the actual javascript file that has been included on the webpage.

for example:

script 1 generates script 2 but script 1 relies on json object in script 2.

In script 2 i generate a json object - echo "var jsonobj = ".$jsonobj;
and in script 1 i pick up this javascript object.

Problem is IE does not find jsonobj it is undefined or null where as in Firefox i can use the object and all is great.

What I want to know is, is this technique not valid in IE or am i doing something wrong?

Let me know if this is not clear.