Div inside div

Div inside div

<

div >

< div id ="menu" style =" width : 30% ; ">

< input id ="Button1" type ="button" value ="button" /></ div >

< div id ="newdivs" style =" width : 70% ; "></ div >

</ div >

< div id ="divtoadd" visible ="false">

< h3 > this is my div </ h3 >

< h4 > body </ h4 >

</ div >

 

1.i want that when i click on button, div to add must be added in the newdivs,

2. second i want to add cross button on divtobeadd, how to do that