var isDOM = document.getElementById? true : false; 
var isNS4 = document.layers? true : false;
if (isNS4) document.captureEvents(Event.KEYPRESS);

document.onkeydown = function (evt) {
if (isNS4) key = evt.which;
  	else if (isDOM) key = (evt || event).keyCode;
      
if (key == 13)
   	{
	    buildsrch();            
	    return false;
	}
}