function backgray(elid)
	{
		pom=document.getElementById(elid);
		pom.style['background']='rgb(200,200,200)';
	}
	function backtrans(elid)
	{
		pom=document.getElementById(elid);
		pom.style['background']='transparent';
	}
	
function backred(elid)
	{
		pom=document.getElementById(elid);
		pom.style['background']='rgb(250,90,100)';
	}
	
function showhide(objid)
  {
	  
		el=document.getElementById(objid);
		if (el.style.display=='block')
		     el.style.display='none';
		else
		   el.style.display='block'; 		 
	}