function change(t){
        document.getElementById('cp').className='button';
        document.getElementById('pd').className='button';
        document.getElementById('bl').className='button';
        document.getElementById('sl').className='button';
        document.getElementById(t).className='button_sellingleads';
        document.searchform.type.value=t;
 	 document.searchform.action='/search/search.jsp';

        if (document.getElementById('search')!=null){
            if (t=='sl'){
                document.getElementById('search').innerHTML='New opportunities for you to buy from the world HERE';
		document.searchform.action='/search/search_lead.jsp';
            }else{
                if (t=='bl'){
                    document.getElementById('search').innerHTML='The output channel of your products HERE';
			document.searchform.action='/search/search_lead.jsp';
                }else{
                    if (t=='cp'){
                        document.getElementById('search').innerHTML='Search the global suppliers/buyers NOW';
						document.searchform.action='/search/search_com.jsp';
                    }else{
                        document.getElementById('search').innerHTML='The world of products HERE';
			  document.searchform.action='/search/search_pro.jsp';

                    }

                }
            }
        }
    }