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How to refresh the Constant of Tab in iframes-on-demand mode

Hello Sir,

In my project I am using dhtmlxTab ( iframes-on-demand mode) where , I want to refresh or reload the Constant of say Tab_1. How I can do that? please do needful action ASAP.
Please refer the code below which i have used ,

tabbar=new dhtmlXTabBar("a_tabbar","top");
                tabbar.setImagePath("dhtmlx/dhtmlxTabbar/codebase/imgs/");
                tabbar.setHrefMode("iframes-on-demand");
                tabbar.preventIECashing(true);
                tabbar.setStyle("modern");
                tabbar.addTab("a1","RSS Distribution","100px");
                tabbar.addTab("a2","Statistics","100px");
                tabbar.addTab("a3","IDEAL MEAN","100px");
                tabbar.addTab("a4","Add/Remove Files","115px");
                tabbar.addTab("a5","Process Data","100px");
                tabbar.setContentHref("a1","rss_distribution.jsp?stack_id=<%=stack_id%>&lcellcolor=<%=lcellcolor%>&ucellcolor=<%=ucellcolor%>&mean=<%=mean%>&sigma=<%=sigma%>");
                tabbar.setContentHref("a2","stack_statistics.jsp?stack_id=<%=stack_id%>&lsl=<%=lsl%>&usl=<%=usl%>");
                tabbar.setContentHref("a3","stack_ideal_mean.jsp?stack_id=<%=stack_id%>");
                tabbar.setContentHref("a4","stack_add_remove_files.jsp?stack_id=<%=stack_id%>&owner=<%=owner%>&title=<%=title%>");
                tabbar.setContentHref("a5","stack_process_data.jsp?stack_id=<%=stack_id%>");
                tabbar.setTabActive("a1");

tabbar.setContentHref("a1",new_url);

if(tabbar.getActiveTab()=="a1") tabbar.forceLoad("a1"); 

Hello Sir,

In my case both URL'S (url & new_url) are same. I want to reload the Constant of tab a1 if I am in any tab. I have apply above method which you sent me but its not reloding the url file even if I am in tab a1 , its blinks once but the Constant of the file are not reflecting the changes. Please do needful ASAP.