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How should i use to load data using java Script?

You need to 
a) create object
b) define header structure
c) load data from any possible datasource

 mygrid = new dhtmlXGridObject('gridbox');

 mygrid.setHeader("Column A, Column B");
 mygrid.setInitWidths("100,250")
 mygrid.init();

 mygrid.loadXML("grid.xml");