function valid()
{
	var val = document.login;
	if(val.username.value=="")
	{
		alert("Please enter user name.\n");
		val.username.focus();
		return false;
	}
	if(val.username.value!="")
	{ 
	 	var a = val.username.value.split(" "); //alert(a);
	   if(a[0]=="")
	   {
		alert("Please do not start username with space .\n");
		val.username.focus();
		 return false;
	   }
	   if(isAllChars(val.username.value)==false)
	  {
		alert("Please enter valid user name.\n");
		val.username.focus();
		return false;
	 }
	 if(val.username.value.search(" ")>-1)
		{
			 alert("Space is not allowed in user name.\n");
			 val.username.focus();
			 return false;
		}
	}
	if(val.password.value=="")
	{
		alert("Please enter Password.\n");
		val.password.focus();
		return false;
	}
return true;
}

function isAllChars(objValue)
{
		var characters=" abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ.@1234567890"
		var tmp
		var lTag
		lTag = 0
		temp = (objValue.length)
		for (var i=0;i<temp;i++)
		{
			tmp=objValue.substring(i,i+1)
			if (characters.indexOf(tmp)==-1)
			{
				lTag = 1
			}
		}
		if(lTag == 1)
			return false
		else
			return true
}