Question

i have two radio button:
radiobutton1 and radiobutton2 and when i hover over it i showed the jquery-ui dialog window… currently its showing the dialogue too far to the right… what i want to show the dialog window right underneath the radiobutton. as shown in second image.

   $(document).ready(function () {

            $('#div_').dialog({
                autoOpen: false,
            });  

           $(".radiobutton1").hover(
                function (){
                   $('#div_').dialog({title: "Iamge Left)"});               
                   $('#div_').removeClass("radiobutton1_1 radiobutton2").dialog('open'); 
                    var target = $(this);     
                    $("#div_").dialog("wid").position({        
                        my: 'center top',        
                        at: 'center bottom'//,        
                        //of: target     
                    });
                },
                function (){
                   $('#div_').dialog('close');
            });

            $(".radiobutton2").hover(
                function (){
                   $('#div_').dialog({title: "Images Right"});               
                   $('#div_').removeClass("radiobutton1_1 radiobutton2").addClass("radiobutton2").dialog('open'); 
                   $("#div_").dialog("wid").position({        
                        my: 'center top',        
                        at: 'center bottom'//,        
                        //of: target     
                    });
                },
                function (){
                   $('#div_').dialog('close');
            });  
    });

Answer 1

I think what you have is almost correct. You just need to have my: 'left top', instead of my: 'center top' in the position method. Also, change .dialog("wid") to .dialog("widget"). I am guessing the latter is a typo at your side.

var target = $(this);
$("#div_").dialog("widget").position({
    my: 'left top',
    at: 'center bottom',        
    of: target     
});

See this in action: http://jsfiddle.net/william/dVZex/.