function RolJPG(filename,obj)
{
	obj.src = filename;
}

function changetype(object)
{
type= object.value;
doc    = document.getElementById('document');
href   = document.getElementById('link');



doc.style.display = 'none';
href.style.display='none';


obj=document.getElementById(object.value);

obj.style.display='block';

}