One of my client site is not working properly. when i try to open on high resolution it just show long horizontal scroll bar. i try to resolve it but not succeed, is there any one who know how to get rid of that so please suggest me.

Can you provide a URL to the site?

The problem might be using site height in width fixed size instead of using it in percent.Please check or else provide us the link.

Use DIV to move your website at the center, and make your width 950px maximum so it may show fine in any resolution.