function disableselect(e)
 {
    return false
 }
 function reEnable()
 {
    return true
 }
 //if IE4+
 document.onselectstart=new Function ("return false")
 //if NS6
 if (window.sidebar)
 {
    document.onmousedown=disableselect
    document.onclick=reEnable
 }

function tecla(){
	if (event.ctrlKey && (event.keyCode == 67 || event.keyCode == 86 || event.keyCode == 65))
	{
		event.keyCode=0;
		event.returnValue=false;
	}
} //
document.onkeydown=tecla;