function showMainContent(divid)
	 {
	    var content = "cont";
	    var showdiv = document.getElementById(divid);
	    var countcontent = 6; //change the no. of divs
	    var liname="sub";
	    for(i=1;i<=countcontent;i++)
	    {
	        content = "cont" + i;
	        document.getElementById(content).style.display='none'; 
	         liname = "sub" + i;
	        document.getElementById(liname).className='';   
	    }
	   
	   
	   document.getElementById("cont" +  divid).style.display='';   
	   document.getElementById("sub" + divid).className='selected';   
	 }