if ( reportContext.getOutputFormat() == "pdf" ) { 
    // Give each table in the report a name, and add the names to the list below, e.g. ["mainTable", "childTable1"] 
    var tableListing = ["mainTable"]; 
    for each(var tableName in tableListing) { 
        var table = reportContext.getReportRunnable().designHandle.getDesignHandle().findElement(tableName) 
        if (table != null) { 
            table.setProperty("pageBreakInterval", 0); 
        } 
    } 
}