//After click 'Add' button , set all textbox's value as ""; dropdownlist value as "";
//参数为一个table或者其他容器元素的id值, 且在该table或者其他容器元素里嵌套了text或textarea元素.
//注意:在界面设计的时候,DropDownList要设一个<asp:ListItem value=""></asp:ListItem>.
function JSetNull(tableID)
{
  var obj=document.getElementById(tableID).all;
  for(i=0;i<obj.length;i++)
  {
     if(obj[i].type=="text" || obj[i].type=="textarea" || obj[i].type=="select-one")
     {
        obj[i].value="";
     }
  }
}


//function : set all textbox and dropdownlist disabled=true,when in the status of browse 
//parameter: container ,such as table element
//notice   : 
function JSetDisabled(tableID)
{
   var obj=document.getElementById(tableID).all;
   for(i=0;i<obj.length;i++)
   {
      if(obj[i].type=="text" || obj[i].type=="textarea" || obj[i].type=="select-one")
      {
         obj[i].disabled=true;
      }
   }
}

//function : set all textbox and dropdownlist disabled=false,when in the status of add,modify 
//parameter: container ,such as table element
//notice   : 
function JSetEnabled(tableID)
{
   var obj=document.getElementById(tableID).all;
   for(i=0;i<obj.length;i++)
   {
      if(obj[i].type=="text" || obj[i].type=="textarea" || obj[i].type=="select-one")
      {
         obj[i].disabled=false;
      }
   }
}



//----------------------------
//-----------------------------------------------------------------------
//Purpose:
//	Check whether the email format is valid
//Parameters:
//	sEmail:	email account
//Return:
//	true -- valid email; false -- invalid email
//-----------------------------------------------------------------------
function IsValidEmail(sEmail)
{
    if((sEmail == null) || (sEmail == "") || 
	    (sEmail.match(/\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*/g) != null))
	    return true;
    else
	    return false;
}