function CheckForm(){
				if (document.myform.username.value==''||document.myform.username.value=='请输入用户名!'){alert('请输入用户名!');document.myform.username.focus();return false;}
				if (document.myform.password.value==''||document.myform.password.value=='请输入密码!'){alert('请输入登录密码!');document.myform.password.focus();return false; }
				 
				 return true;
			}
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