function clickIE() {if (document.all) {(message);return false;}}
function clickNS(e) {if 
(document.layers||(document.getElementById&&!document.all)) {
if (e.which==2||e.which==3) {(message);return false;}}}
if (document.layers) 
{document.captureEvents(Event.MOUSEDOWN);document.onmousedown=clickNS;}
else{document.onmouseup=clickNS;document.oncontextmenu=clickIE;}
document.oncontextmenu=new Function("return false")


document.onkeydown= function desabilita_control(e){
	//tabelas de keycode
	//http://www.codigosnaweb.com/tutoriais/block_letra.html

	if(window.event) { 
		//IE
		keycode = window.event.keyCode
		if(window.event.ctrlKey && keycode==85){ //ctrl u
			void(0);
			return false;
		}else if(window.event.ctrlKey && keycode==65){ //ctrl a
			void(0);
			return false;
		}else if(window.event.ctrlKey && keycode==83){ //ctrl S
			void(0);
			return false;
		}else{}
				
	}else{
		//firefox
		if (e.ctrlKey && e.keyCode==85){ //ctrl a
			return false;
			void(0);
			alert("a");
		
		}else if (e.ctrlKey && e.keyCode==65) {//ctrl u
			return false;
			void(0);
		}else if (e.ctrlKey && e.keyCode==83){ //ctrl S
			return false;
			void(0);
		}else{ 
		///final elses
		}
	}
}