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Problem for DHTMLXGrid Dynamiccally loading and smart rendring.

I am Creating Dhtmlx grid with big dataset having upto 3,00,000 rows.
by using Dynamic loading and smart rendering concept. it load grid in IE with some errorr as Object error and
in mozilla grid not load but shows only header with following error.

dhtmlXHeir is not defined

[Break on this error] function dhtmlxArray(ar){ return dhtmlXHeir((ar||new Array()),new _dhtmlxArray()...

what's wrong with me.
also anather things can u explain me
1) how can i chnage URL parameters to being send on server side.?
2) which event raise to load next rows from server side, by scrolling ?
3) can i chnage URL dynamically for loading grid.?

Thanks,
BAPU

>>dhtmlXHeir is not defined
The order of js files is incorrect, please check 
            http://dhtmlx.com/docs/products/dhtmlxGrid/doc/articles/Common_Problems_in_Grid.html#grid_art_comprob

>>1) how can i chnage URL parameters to being send on server side.?
The dyn. loading path stored as
   grid.kidsXmlFile
The srnd loading path stored as
   grid.xmlFileUrl 
You can add necessary params to both paths at any time. 
Also onDynXLS event can be used to intercept calls and form any kind of custom URL.

>>2) which event raise to load next rows from server side, by scrolling ?
onDynXLS