I am using two different jQuery plugins; one for news logo ticker and another for horizontal text slider.
but only one of them is working at a time when when used in sin
I faced the same problem when using a lot of plugins for my web page. The easiest solution is to have a concatenated file of all the .js files and have a single include at the head. Also you can minify ( minify tools available online ) the concatenated file and just include the min version. This should solve the problem.
One more way is to make sure the plugin is available before you call the function in the plugin. Try to use getScript of jquery to ensure both plugins are loaded and make the function calls of plugin inside success handler of getScript