/***********************************************************************
************************************************************************
script voor betere input site veh: overwrite en automatisch naar een 
volgend invoerveld als juiste aantal karakters is ingevoerd
************************************************************************
***********************************************************************/

// ********** overwrite modus 
function start(){
	document.execCommand('OverWrite', false, true);
}


// These functions ONLY work on MSIE (Win)
// Gets Cursor Position by comparing to a moving text range.
function GetCursorPosition() {
	var obj = document.activeElement;
	var cur = document.selection.createRange();
	var pos = 0;
	if (obj && cur) {
		var tr = obj.createTextRange();
		if (tr) {
			while (cur.compareEndPoints("StartToStart", tr) > 0) {
				tr.moveStart("character", 1);
				pos++;
			}
			return pos;
		}
	}
	return -1;
}

function ShowPos(obj) {
	// controle op IE, anders FF/Mozila/Safari (het else deel)
	start();
	var position;
	if (document.selection){
		//var p = document.getElementById(naam);
		position = GetCursorPosition();
	} else if (obj.selectionStart){
		position = obj.selectionStart;
	}
	return position;
}