function validateEmail(str){
	        var patn = /^[_a-zA-Z0-9\-]+(\.[_a-zA-Z0-9\-]*)*@[a-zA-Z0-9\-]+([\.][a-zA-Z0-9\-]+)+$/;
	        if(patn.test(str)){
		        return 0;
	        }else{
		        return 1; 
	        }
        }
		function SendMailto(){
	        var tmpText=prompt('请输入您朋友的EMail：',document.mailto.email.value);
	        if(tmpText){
	            if (validateEmail(tmpText) == 1){
	                alert("Email格式不正确，请重新输入！");
	                SendMailto();
	                return;
	            }    
		        document.mailto.email.value = tmpText;
		        document.mailto.newstitle.value = document.title;
		        document.mailto.newslink.value = document.location.href;
		        document.mailto.submit();
	        }
        }