function checkbox(item)
{
  if(item.value=="on")
  {
    item.value="off";
    item.checked=false;
  }else{
    item.value="on";
    item.checked=true;
  }
}

function selectCheckbox(item)
{
    if(item.value=="on")
	{
      item.checked=true;
    }else{
      item.checked=false;
    }
}

//使下拉控件的某一项为选定项
function selectoption(obj,value)
{
  for(i=0;i<obj.length;i++)
  {
    if(obj[i].value==value)
    {
      obj[i].selected=true;
    }
  }
}

function IsDigit()
{
	return ((event.keyCode >= 48) && (event.keyCode <= 57));
}

function isDigit(data)
{
  if (!data)
  {
    return false;
  }else {
	  return /(^[0-9]{1,4}$)/.test(data);
  }
}

function isHTML(src)
{
	if(src.indexOf("<")>=0 || src.indexOf(">")>=0)
	{
		return true;
	}else{
		return false;
	}
}

//邮箱
function isEmail(email)
{
	return /^\w+((-\w+)|(\.\w+))*\@[A-Za-z0-9]+((\.|-)[A-Za-z0-9]+)*\.[A-Za-z0-9]+$/.test(email); 
}

function checkPhone(phone)
{
  if (!phone)
  {
    return false;
  }else {
      if(isNaN(phone)){
          return true;
      }else{
          return false;
      }
  }
  return true;	
}

//获得Cookie解码后的值
function GetCookieVal(offset)
{
	var endstr = document.cookie.indexOf (";", offset);
	if (endstr == -1)
		endstr = document.cookie.length;
	return unescape(document.cookie.substring(offset, endstr));
}

//设定Cookie值
function SetCookie(name, value)
{
	var expdate = new Date();
	var argv = SetCookie.arguments;
	var argc = SetCookie.arguments.length;
	var expires = (argc > 2) ? argv[2] : null;
	var path = (argc > 3) ? argv[3] : null;
	var domain = (argc > 4) ? argv[4] : null;
	var secure = (argc > 5) ? argv[5] : false;
	if(expires!=null) expdate.setTime(expdate.getTime() + ( expires * 1000 ));
	document.cookie = name + "=" + escape (value) +((expires == null) ? "" : ("; expires="+ expdate.toGMTString()))+((path == null) ? "" : ("; path=" + path)) +((domain == null) ? "" : ("; domain=" + domain))+((secure == true) ? "; secure" : "");
}

//删除Cookie
function DelCookie(name)
{
	var exp = new Date();
	exp.setTime (exp.getTime() - 1);
	var cval = GetCookie (name);
	document.cookie = name + "=" + cval + "; expires="+ exp.toGMTString();
}

//获得Cookie的原始值
function GetCookie(name)
{
	var arg = name + "=";
	var alen = arg.length;
	var clen = document.cookie.length;
	var i = 0;
	while (i < clen)
	{
		var j = i + alen;
		if (document.cookie.substring(i, j) == arg)
			return GetCookieVal (j);
		i = document.cookie.indexOf(" ", i) + 1;
		if (i == 0) break;
	}
	return null;
}

////////////////////     按钮roll over 特效     /////////////////////////////////////////
function imgOnmouseover(item)
{
	item.src=item.src.substring(0,item.src.length-4)+"_over.gif";   
} 

function imgOnmouseout(item)
{
   
    item.src=item.src.substring(0,item.src.length-9)+".gif";  
}