[Javascript] javascript DOM doubt

[asureshkumar_1983 at yahoo.co.in (suresh kumar)]

Hi,
     sorry for repeatively asking my doubt.bcz i am can't able to solve this problem .
  suppose i am already having a parent node and the child node.i want to append a another child node below the already available child node.
   
  this is the already available tree 
   
               <div id='iedisplayarea'>     //parent node  
                       |
                       |
               <img id='ashow'>              //child node of iedisplay area
   
  i want to change the tree as 
   
           <div id='iedisplayarea'>     //parent node  
                       |
                       |
               <img id='ashow'>              //child node of iedisplay area
                       |
                       |
               <img id='ashow1'>            //child node of ashow
   
  i used this are the functions.
              var x=document.getElementById('ashow');
              var y=document.createElement('IMG');
                   y.setAttribute('id','ashow1');
   
              this.y=x.appendChild(y);    //giving an error msg as -"unexpected call to method or property access"
                                                                          A.suresh

 				
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