function checkform()
{
var flag = true
if(flag)
{
	if(document.form1.UserName.value.length == 0) 
		{
	    alert("Please enter a value for your user name.");
	    document.form1.UserName.focus();
	    flag=false
	  }
}
if(flag)
{
	if(document.form1.Password.value.length == 0) 
	{
		alert("Please enter a value for your password.");
		document.form1.Password.focus();
	    flag=false
	}
	
}
if(flag)
	{
	document.form1.submit()
	}
}