function checkForm(form){

if(form.company.value == ""){
alert("请输入您的公司名称！");
form.company.focus();  
return false;
}

if(form.name.value == ""){
alert("请输入您的姓名！");
form.name.focus();  
return false;
}

if(form.phone.value == ""){
alert("请输入您的联络电话！");
form.phone.focus();
return false;
}

if(form.country.value == ""){
alert("请输入您所在的区域");
form.country.focus();  
return false;
}

if(form.email.value == "")
{
alert("请输入您的电子信箱！");
form.email.focus();  
return false;
}

if(form.email.value.indexOf('@') == -1 || form.email.value.indexOf('.') == -1 || form.email.value.indexOf('@.') != -1 || form.email.value.indexOf('.@') != -1 ){
alert('电子信箱格式错误！');
form.email.focus();
return false;
}

if(form.subject.value == ""){
alert("请输入您要提问的问题！");
form.subject.focus();  
return false;
}

return true;
}