$(document).ready(function()
{
    var ctrlDown = false;
    var ctrlKey = 17, vKey = 86, cKey = 67;
 
    $(document).keydown(function(e)
    {
        if (e.keyCode == ctrlKey) ctrlDown = true;
    }).keyup(function(e)
    {
        if (e.keyCode == ctrlKey) ctrlDown = false;
    });
 
    $(":text,textarea").keydown(function(e)
    {
        if (ctrlDown && (e.keyCode == vKey || e.keyCode == cKey)) return false;
    });
})