function check(checkOK,checkStr)
 { if (checkStr==""  ) 
   return (true);
   var isvalid= true;
   for (i = 0;  i < checkStr.length;  i++)
    {
		ch = checkStr.charAt(i);
		for (j = 0;  j < checkOK.length;  j++)
		if (ch == checkOK.charAt(j))
			break;
		if (j == checkOK.length)
		{
			isvalid = false;
			return (isvalid);
			break;
		}
    }
 }
function login(land){
  if ((document.land.username.value=="")||(document.land.password.value=="")){
     alert("请输入用户名/密码！");
	 land.username.focus();
     return (false);
  }
   if (!fucCheckSTR(document.land.username.value))
  {
    alert("用户名只能使用英文字母和数字！");
	 land.username.focus();
    return (false);
  }
	  if (document.land.username.value.length < 4)
  {
    alert("用户名至少4个字符！");
	land.username.focus();
    return false;
  }

  if (document.land.password.value.length < 6)
  {
   alert("密码至少6位！");
   land.password.focus();
   return (false);
  }
   return (true);
}
 function fucCheckSTR(NUM)
 {
    var i,j,strTemp;
    strTemp="0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_";
    if ( NUM.length== 0)
        return 0
    for (i=0;i<NUM.length;i++)
    {
       j=strTemp.indexOf(NUM.charAt(i));
       if (j==-1)
       {
         return 0;
       }
    }
    return 1;
 }
 function CheckSelect(selectname,CheckValue)                                             
  { var len = selectname.length                                             
    for (var i = 1; i<= len ;++i)                                             
     { if (selectname[i-1].value==CheckValue)                                             
         { selectname[i-1].selected = true;                                             
           break;                                             
          }                                             
     }                                             
  } 
function TSearch(ThisForm)
{   
    
  var FoundError = false
  var Errormsg = ' '


 if(ThisForm.skey.value =="请输入关键字")
   {
    ThisForm.skey.focus()
    FoundError = true
    Errormsg = "未输入关键字...\n"
   } 
 if(ThisForm.skey.value =="")
   {
    ThisForm.skey.focus()
    FoundError = true
    Errormsg = "未输入关键字...\n"
   }

 if(FoundError == false)
  {      
    //return confirm(askmsg)
  }
  else
  {
    alert(Errormsg)
    return false
  }  

}
function CSearch(ThisForm)
{   
    
  var FoundError = false
  var Errormsg = ' '


 if(ThisForm.value =="请输入关键字")
   {
    ThisForm.focus()
    FoundError = true
    Errormsg = "未输入关键字...\n"
   } 
 if(ThisForm.value =="")
   {
    ThisForm.focus()
    FoundError = true
    Errormsg = "未输入关键字...\n"
   }

 if(FoundError == false)
  {      
    //return confirm(askmsg)
  }
  else
  {
    alert(Errormsg)
    return false
  }  

}
function on_Focus(ThisForm){
 ThisForm.value="";
}
var ForwardShow=true;
function ShowPromptInfo()
{
	var TempStr=ShowInfoArea.innerText;
	if (ForwardShow==true)
	{
		if (TempStr.length>4) ForwardShow=false;
		ShowInfoArea.innerText=TempStr+'>';
		
	}
	else
	{
		if (TempStr.length==1) ForwardShow=true;
		ShowInfoArea.innerText='>';
	}
}