// JavaScript Document

// JavaScript Document

function insert ( form, element, starttag, endtag ) {
	var field = document.forms[form].elements[element];
	if ( typeof document.selection != 'undefined' ) {
		var range = document.selection.createRange();
		var insert = range.text;
		range.text = starttag + insert + endtag;
		insert = range.text;
		range = document.selection.createRange();
		if ( insert.length == 0 ) {
			range.move('character', -endtag.length);
		}
		else {
			range.moveStart('character',insert.length);
		}
		range.select();
	}
	else if ( typeof field.selectionStart != 'undefined' ) {
		var start = field.selectionStart;
		var end = field.selectionEnd;
		var insert = field.value.substring(start,end);
		field.value = field.value.substr(0,start) + starttag + insert + endtag + field.value.substr(end);
		var position;
		if ( insert.length == 0 ) {
			pos = start + starttag.length;
		}
		else {
			pos = end + starttag.length + endtag.length;
		}
		field.selectionStart = pos;
		field.selectionEnd = pos;
	}
	else {
		var pos;
		var regex = RegExp('[0-9]{0,3}$');
		while ( !regex.test(pos) ) {
			pos = prompt('Einfügen an Position (0..' + field.value.length + '):','0');
		}
		if ( pos > field.value.length ) {
			pos = field.value.length;
		}
		var insert = prompt('Bitte geben sie einen Text ein:');
		field.value = field.value.substr(0,pos) + starttag + insert + endtag + field.value.substr(pos);
	}
}