<!--
function btnSubmit(){
 
  if (ltrim(document.frmSendMail.username.value) == "" ){
	    alert("发信人姓名不能为空，请填写！");
	    return false;
  }

  if (ltrim(document.frmSendMail.usermail.value) != "" ){
	    
        i = document.frmSendMail.usermail.value.indexOf("@");
        if(i == -1){
		alert("发信人email填写错误，请重新填写！");
	    return false;
		}

  }else{
  		alert("发信人email不能为空，请填写！");
	    return false;
  }

  /*
  if (ltrim(document.frmSendMail.usermail.value) == "" ){
	    alert("");
	    return false;
	    }
  if (ltrim(document.frmSendMail.userphone.value) == "" ){
	    alert("");
	    return false;
	    }
  if (ltrim(document.frmSendMail.useraddress.value) == "" ){
	    alert("");
	    return false;
	    }
  if (ltrim(document.frmSendMail.userzip.value) == "" ){
	    alert("");
	    return false;
	    }
  */
  if (ltrim(document.frmSendMail.mailobject.value) == "" ){
	    alert("标题不能为空，请填写！");
	    return false;
  }

  if (ltrim(document.frmSendMail.mailbody.value) == "" ){
	    alert("正文不能为空，请填写！");
	    return false;
  }


} 

function ltrim(str) {
    while (str.charAt(0) == ' ') str=str.substring(1,str.length);
    return str;
}

//-->