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modalw(
    {
        // Assign a name to window   
        name: 'MymodalWindow1',                              

        // The width of window
        width: 300,                                         

        // The height of window
        height: 200,  

        // The HTML code in the body of window
        html: '<div>This is a modal draggable window</div>' 

        // The title of window
        title: 'My title',                                  

        // The background color of window
        bgColor: '#eeeeee',                                  

        // The border color of window
        borderColor: '#aaaaaa'                              
   } )

After call this function can use:

MymodalWindow1.html('New HTML code'')    
MymodalWindow1.bgColor('#ddeeff') 
MymodalWindow1.borderColor('#444444') 
MymodalWindow1.close()

or

window['MymodalWindow1'].html('New HTML code'')
window['MymodalWindow1'].bgColor('#ddeeff')
window['MymodalWindow1'].borderColor('#444444')
window['MymodalWindow1'].close()