// JScript File
  
    function isempty(obj)
   {
	    if (obj.value =="")
	    {
	      alert ("Please enter the quantity");
	      obj.focus();
	      return false;
	    }
	    if (obj.value <=0)
	    {
	        alert ("Quantity is not valid");
	        obj.focus();
	        return false;
	    }
   }

   function onlynumber(obj)
   {
	    reg = /[^0-9]/g;
	    obj.value =  obj.value.replace(reg,"");
   }

    function ltrim (s)
    {
        return s.replace( /^\s*/, "" );
    }
    function validate()
    {
        var username=document.getElementById("txtusername");
        var pwd=document.getElementById("txtpwd");
        if (ltrim(username.value)=="")
        { alert("Please enter username"); username.value=""; username.focus(); return false; }
        
        if (ltrim(pwd.value)=="")
        { alert("Please enter password"); pwd.value=""; pwd.focus(); return false; }
        
        return true;
    }
    function keydownhandler(event)
    {
    if(event && event.which) 
    {
        var e=event;
        var charCode=e.which;
    } 
    else 
    {
        var e=window.event;
        var charCode=e.keyCode;
    }
    // process only the Enter key
    if (charCode == 13)
    { 
        // cancel the default submit
        e.returnValue=false;
        e.cancel = true;        
        // submit the form by programmatically clicking the specified button
        var btn = document.getElementById("btnlogin");
        // finding the browser, and changing action according to that
        if (navigator.appName.indexOf("Microsoft Internet Explorer")>(-1))                
            btn.click();        
        else        
            btn.focus();
    }
    }