function commonKeyDownEvent(){
	if ((window.event.altKey)&&((window.event.keyCode==37)||(window.event.keyCode==39))){ //Alt+ <-  //Alt+ ->
		event.returnValue=false;
	}
	if (event.keyCode==93){//
		event.returnValue=false;
	}
	if (event.keyCode==114){//F3
		event.returnValue=false;
		event.keyCode=0;
	}
	if (event.keyCode==116){//F5
		event.returnValue=false;
		event.keyCode=0;
	}
	if ((event.ctrlKey)&&(event.keyCode==78)) //Ctrl+n
		event.returnValue=false;
	if ((event.shiftKey)&&(event.keyCode==121)) //shift+F10
		event.returnValue=false;
	if (event.keyCode==122){ //F11
		event.returnValue=false;
		event.keyCode=0;
	}
	if (window.event.srcElement.tagName == "A" && window.event.shiftKey) 
		window.event.returnValue = false;
	if ((window.event.altKey)&&(window.event.keyCode==115)){ //Alt+F4
		window.showModelessDialog("about:blank","","dialogWidth:1px;dialogheight:1px");
		return false;
	}
	if (event.keyCode==8&& window.event.srcElement.type !='text'&& window.event.srcElement.tagName !='TEXTAREA'){
		event.keyCode=0;
		event.returnValue=false;
	}
}