var nav = window.Event ? true : false; 
if (nav) { 
window.captureEvents(Event.KEYDOWN); 
window.onkeydown = NetscapeEventHandler_KeyDown; 
} else { 
document.onkeydown = MicrosoftEventHandler_KeyDown; 
} 

function NetscapeEventHandler_KeyDown(e) { 
if (e.which == 13 && e.target.type != 'textarea' && e.target.type != 'submit') { return false; } 
return true; 
} 

function MicrosoftEventHandler_KeyDown() { 
if (event.keyCode == 13 && event.srcElement.type != 'textarea' && event.srcElement.type != 'submit') 
return false; 
return true; 
} 




function numbersonly(myfield, e)
{
var key;
var keychar;

if (window.event)
   key = window.event.keyCode;
else if (e)
   key = e.which;
else
   return true;
keychar = String.fromCharCode(key);

// control keys
if ((key==null) || (key==0) || (key==8) || 
    (key==9) || (key==13) || (key==27) )
   return true;

// numbers
else if ((("0123456789.").indexOf(keychar) > -1))
		{
			if  ((".").indexOf(keychar) > -1 )
			{
				if (myfield.value.indexOf(keychar) > -1)
					return false;
				else
					return true;
			}
				else
			{
			   return true;
			}
		}
else
   return false;
}