// JScript 文件

// JScript 文件


function check() {

   

    if (document.getElementById("txtname").value == "") {
        alert("Your name can't for empty！");
        
        return false;
    }
   
    if (document.getElementById("txtemail").value == "") {
        alert("EMAIL can't for empty ！");
        return false;
    }

    if (!isemail(document.getElementById("txtemail").value)) {

        alert("EMAIL format is not correct ");
        return false;
    }

  if (document.getElementById("txttel").value == "") {
            alert("Contact telephone can't for empty ！");
            return false;
        }
        
         var strP=/^\d+$/;
            if(!strP.test(document.getElementById("txttel").value)) {
            alert("Contact telephone should enter the Numbers ！"); 
          document.getElementById("ctl00_ContentPlaceHolder1_txttel").focus(); 
            return false; 
            }

    if (document.getElementById("txtcontent").value == "") {
        alert("Your message content can't for empty ！");
        return false;
    }
    if (document.getElementById("txtcontent").value.length > 100) {
        alert("Sorry, message content is too long ！");
        return false;
    }
   

    return true;

}
function isemail(str) //邮箱验证
{
    var result = str.match(/^\w+((-\w+)|(\.\w+))*\@[A-Za-z0-9]+((\.|-)[A-Za-z0-9]+)*\.[A-Za-z0-9]+$/);
    if (result == null) return false;
    return true;
}