// Display form as inline pop-up in the middle of the screen

function ShowPopup(FormID)
{
    var objForm = document.getElementById(FormID);
    
    if(objForm)
    {
        //show form
        objForm.style.display = "";
        
        //position form
        var intFormPositionTop = (document.body.clientHeight - objForm.offsetHeight) / 2;
        var intFormPositionLeft = (document.body.clientWidth - objForm.offsetWidth) / 2;
        
        objForm.style.top = intFormPositionTop + "px";
        objForm.style.left = intFormPositionLeft + "px";
    }
    else
    {
        //form cannot be found, show error popup
        alert("We're sorry, the form cannot be displayed.");
    }
}