document.onselectstart=canIt;
document.oncontextmenu=canIt;

function canIt(){
	if(window.event){
		if(window.event.srcElement.tagName!="INPUT" && window.event.srcElement.tagName!="TEXTAREA"){
			window.event.cancelBubble = true;
			return false;
		}
	}
}

function catchKey(){
	if(window.event && isDisabled(window.event.keyCode)){
		window.event.keyCode = 505;
		window.event.returnValue=false;
	}
	if(window.event && window.event.keyCode == 505){
		return false; 
	}
}

function isDisabled(kc){
	if(window.event.ctrlKey){
		if(kc==67||kc==86){
			return false;
		}else if(kc > 64 && kc < 91){
			return true;
		}
	}
	if(kc==116||kc==115||kc==117){
		return true;
	}
}