Okay, so if i have multiple class in tr,it should like this

<tr class="firstclass secondclass">
//some code here
what about other scenario maybe this also can be the cause why my script did not work...when i navigate other page i just use .load() function and in my url it will never change it always firstpage.php but in the body is now the content of secondpage.php,now does all my javascript in secondpage will work?

I hope you get my point.Thank you in advance.