function drawimage(imgd,iwidth,iheight){ 

     

       var image=new image(); 

       image.src=imgd.src; 

       if(image.width>0 && image.height>0){

          if(image.width/image.height>= iwidth/iheight){ 

             if(image.width>iwidth){ 

                   imgd.width=iwidth;

                  imgd.height=(image.height*iwidth)/image.width;

              }else{

                  imgd.width=image.width;

                    imgd.height=image.height;

              }

          }else{ 

             if(image.height>iheight){

                    imgd.height=iheight; 

                 imgd.width=(image.width*iheight)/image.height;

                      }else{ 

                 imgd.width=image.width; 

                   imgd.height=image.height; 

             } 

         } 

       }

    }