function wordCount()
 {  
   var content=document.getElementById("txtbox_content").value;
   document.getElementById("count").innerText=content.length;   
 }
 function ckform()
 {
  var content=document.getElementById("txtbox_content").value;
  var name=document.getElementById("txtbox_name").value;  
  var cellphone=document.getElementById("txtcellphone").value;
  
  if(content.replace(/(^\s*)|(\s*$)/g, "").length==0)
  {
    alert('请输入留言内容!');
    document.getElementById("txtbox_content").focus();
    return false;
  }  
  
  if(name.replace(/(^\s*)|(\s*$)/g, "").length==0)
  {
    alert('请填写留言者!');
    document.getElementById("txtbox_name").focus()
    return false;
  }
    
  if(cellphone.length!=0||cellphone.length<8)
  {
     if(isNaN(cellphone))
     {
      alert('请输入正确输入联系电话!');
      document.getElementById("txtcellphone").value="";
      return false;
     }
  }
  
 }
 function isEmail(strEmail) 
   {
    if (strEmail.search(/^\w+((-\w+)|(\.\w+))*\@[A-Za-z0-9]+((\.|-)[A-Za-z0-9]+)*\.[A-Za-z0-9]+$/) != -1)
    return true;
    else
    return false;
   }



function displayfeedback()
{
    var divbox=document.getElementById("div_feedbackboxArea").visibility='visible';
    //if(divbox.visibility)
}