// JavaScript Document
function validate_form() {

  var str0,str1,str2,str3,str4,str;

  validity = true; // assume valid

  if (!check_email(document.Form2000.FriendEmail.value))

        { validity = false; alert('请输入关键字!');}

  if (validity)
  {
	str0=""
	str1="您好!";
	str2="您的朋友向您推荐:";
	str3=document.title;
	str4=this.location;
	str=str0+"\n"+str1+"\n"+str2+"\n"+str3+"\n"+str4+"\n";
	document.Form2000.Context.value=str;
//mailto: aaa@21cn.com?cc=bbb@21cn.com&bcc=ccc@21cn.com&subject=‘mailto'应用技巧拾零&body=mailto标签的综合应用举例说明！
var url="mailto:"+document.Form2000.FriendEmail.value+"?subject="+str3+"&body="+str;
document.write(url); 
window.navigate(url);
window.navigate(str4);

	
  }
  return validity;
}

function check_email(address) {

  if ((address == "")

    || (address.indexOf ('@') == -1)

    || (address.indexOf ('.') == -1))

      return false;

  return true;
}