function validatePassname(name){
		var generalUser=/^[_0-9a-z][\w]*[_0-9a-z]$/ig;
		var emailUser=/^(([_0-9a-zA-Z-]+)|([0-9a-zA-Z]+[_.0-9a-zA-Z-]*[0-9a-zA-Z]+))@([a-zA-Z0-9-]+[.])+([a-zA-Z]{2}|com.cn|cn|com|net|gov|org|edu)$/g;
		 var n=name.match(generalUser);	
		 var m=name.match(emailUser);
		 if(n==name+"" || m==name+""){			 
			 return true;
		 }
		return false;
	}

function checkpassname(){	
	var name=document.getElementById("passname").value;	 
	//var reg=/^[_0-9a-z][\w]*[_0-9a-z]$/ig;
	//var n=name.match(reg);		
	if(name==""){	
		document.getElementById("showerror").innerHTML="<font color=red>*通行证帐号不能为空！</font>";
		return false;
	}else{
		if(name.length < 4 ){			
			document.getElementById("showerror").innerHTML="<font color=red>*通行证帐号不能少于4个字符！</font>";
			return false;
		}else{			
			//if(n!=name+""){	
			  if(!validatePassname(name)){
				document.getElementById("showerror").innerHTML="<font color=red>*通行证帐号含有非法字符或空格，请重新填写！</font>";
				return false;
			}else{	
				document.getElementById("showerror").innerHTML="&nbsp;";										
				return true;								  
			}	
		}
	}
}