function getSelectionStart(o) {
	    if (o.createTextRange) {
		    var r = document.selection.createRange().duplicate();
		    r.moveEnd('character', o.value.length);
		    if (r.text == '') 
		        return o.value.length;
		    return o.value.lastIndexOf(r.text);
	    } 
	    else 
	        return o.selectionStart;
    }    
    function ChooseTag(obj1)
    {        
        s = getSelectionStart(obj1);
        obj1.innerHTML = obj1.innerHTML + obj.value;
    }