if(document.addEventListener){	document.addEventListener('keydown',backSpaceSearch,false);}else{	document.attachEvent('onkeydown',backSpaceSearch)}function backSpaceSearch(event){		var event=event?event:window.event;	if(event.keyCode==8){		var myTarget=event.target || event.srcElement;		if(myTarget.tagName.toLowerCase()=='input' || myTarget.tagName.toLowerCase()=='textarea'){			return;		}else{						if(event.preventDefault){				event.preventDefault();			}else{				event.returnValue=false;			}		}	}}