function getCookie(name) { 
    var start = document.cookie.indexOf( name + "=" ); 
    var len = start + name.length + 1; 
    if ( ( !start ) && ( name != document.cookie.substring( 0, name.length ) ) ) { 
        return null; 
    } 
    if ( start == -1 ) return null; 
    var end = document.cookie.indexOf( ';', len ); 
    if ( end == -1 ) end = document.cookie.length; 
    return unescape( document.cookie.substring( len, end ) ); 
} 

function setCookie(name, value, expires, path, domain, secure ) { 
    var today = new Date(); 
    today.setTime( today.getTime() ); 
    if ( expires ) { 
        expires = expires * 1000 * 60 * 60 * 24; 
    } 
    var expires_date = new Date( today.getTime() + (expires) ); 
    document.cookie = name+'='+escape( value ) + 
        ( ( expires ) ? ';expires='+expires_date.toGMTString() : '' ) + //expires.toGMTString() 
        ( ( path ) ? ';path=' + path : '' ) + 
        ( ( domain ) ? ';domain=' + domain : '' ) + 
        ( ( secure ) ? ';secure' : '' ); 
} 

function deleteCookie( name, path, domain ) { 
    if ( getCookie( name ) ) document.cookie = name + '=' + 
            ( ( path ) ? ';path=' + path : '') + 
            ( ( domain ) ? ';domain=' + domain : '' ) + 
            ';expires=Thu, 01-Jan-1970 00:00:01 GMT'; 
}

function display_ctr(on,off,on1,off1){
	document.getElementById(on).style.display='';
	document.getElementById(off).style.display='none';
	document.getElementById(on1).className='list_midb1';
	document.getElementById(off1).className='list_midb2 list_left5';
}

function display_ctr_index(on1,off1,off2,on11,off11,of21){
	document.getElementById(on1).style.display='';
	document.getElementById(off1).style.display='none';
	document.getElementById(off2).style.display='none';

	document.getElementById(on11).className='news_midb3';
	document.getElementById(off11).className='news_midb2';
	document.getElementById(of21).className='news_midb2';
}


function checkKeyInput(obj){
	var keyword=document.getElementById(obj).value;
	if(keyword ==null || keyword.trim()==""){
		alert("请填写要搜索的关键词！");
		return false;

	}
}

function checkForm(){
        var comment=document.getElementById("comment");
        if (comment.value == "")
        {
          alert("请填写评论！");
          return false;
        }
        return true;
      }