/// Evita Clic Derecho
function clickIE(){
     if (document.all)
  return false;}


function clickNS(e){
     if(document.layers||(document.getElementById&&!document.all)){
         if(e.which==2||e.which==3)
   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")


/// Fin Clic Derecho


function Clear(TheField){
    if (TheField.defaultValue==TheField.value)
        TheField.value = "";
   }

function OnlyNumber(evt){
     var nav4 = window.Event ? true : false;
     var key = nav4 ? evt.which : evt.keyCode;
          return (key <= 13 || (key >= 48 && key <= 57));
   }

function OnlyLetter(evt){
     var nav4 = window.Event ? true : false;
     var key = nav4 ? evt.which : evt.keyCode;
          return (key <= 13 || (key > 64 && key < 91) || (key >= 97 && key < 123) ||(key==32) ||(key==209) ||(key==241));
   }

function OnlySymbol(evt){
     var nav4 = window.Event ? true : false;
     var key = nav4 ? evt.which : evt.keyCode;
          return (key <= 13 || (key >= 48 && key <= 57) || (key > 64 && key < 91) || (key >= 97 && key < 123) ||(key==32) ||(key==209) ||(key==241));
   }

function UpperCase(TheField){
     TheField.value=TheField.value.toUpperCase();
   }