var ajax=new Ajax();window.onload=function(){$("UName").onblur=CheckUName;}
function CheckUName(){var url="../ajax/checkuname.ashx";var name=$("UName").value;var reg=new RegExp("^[0-9a-zA-Z]{4,16}$");if(!reg.test(name)){$("U_Info").innerHTML="用户名只能由英文和数字组成，4~16字符间!";$("UName").focus();return false;}ajax.execute(url,"UName="+name,"get",CheckUName2);}function CheckUName2(){if(ajax.getState()==4){if(ajax.getStatus()==200){var xmlDoc=ajax.getText();if(xmlDoc=="false"){$("U_Info").innerHTML="该用户名可以注册!"; }else{$("U_Info").innerHTML="该用户名已被注册，请换一个!"; $("UName").focus();return false;}}}}