how to make the mouse over pop up window remain

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JScript.NET

Hi,

I have a set of acronyms in my grid and ona a mouse over i ll get the abbreviations for those acronyms on a pop up. I have also added a scroll bar for tat. but I am unable to move the cursor over the pop up and scroll it.
Below is the styles i have applied to the popup.

   #dhtmltooltip1 
       {
            position: absolute;
            width: 150px;
            border: 2px solid block;
            padding: 2px;
            padding-left: 5px;
            padding-top: 5px;
            padding-bottom: 5px;
            line-height: 2em;
            font-family: Arial Baltic;
            font-size: 12px;
            color: #073569;
            visibility: hidden;
            z-index: inherit;
           filter: progid:DXImageTransform.Microsoft.Shadow(color=gray,direction=135);
           max-height:100px;
           overflow:scroll;
           
             
}

Pls help,

Thanks,
Anusha