function countInstances(open,closed) 
{ 
     var opening = document.forms['poster_principal'].elements['poster_contenu'].value.split(open); 
     var closing = document.forms['poster_principal'].elements['poster_contenu'].value.split(closed); 
     return opening.length + closing.length - 2; 
} 

function TAinsert(text1,text2) 
{
     var ta = document.getElementById('poster_contenu');
       
     if (document.selection) { 
        var str = document.selection.createRange().text;
        ta.focus(); 
        var sel = document.selection.createRange(); 
        if (text2!="") 
        { 
           if (str=="") 
           { 
              var instances = countInstances(text1,text2); 
              if (instances%2 != 0){ sel.text = sel.text + text2;} 
              else{ sel.text = sel.text + text1;} 
           } 
           else 
           { 
              sel.text = text1 + sel.text + text2; 
           } 
        } 
        else 
        { 
           sel.text = sel.text + text1; 
        } 
        
     } 
     else if (ta.selectionStart || ta.selectionStart == 0) 
     { 
        if (ta.selectionEnd > ta.value.length) { ta.selectionEnd = ta.value.length; } 
       
        var firstPos = ta.selectionStart; 
        var secondPos = ta.selectionEnd+text1.length;
		var contenuScrollTop = ta.scrollTop;
       
        ta.value=ta.value.slice(0,firstPos)+text1+ta.value.slice(firstPos); 
        ta.value=ta.value.slice(0,secondPos)+text2+ta.value.slice(secondPos); 
         
        ta.selectionStart = firstPos+text1.length; 
        ta.selectionEnd = secondPos; 
        ta.focus();
		ta.scrollTop = contenuScrollTop;
     } 
     else 
     { // Opera 
        var sel = document.poster_principal.poster_contenu; 
       
        var instances = countInstances(text1,text2); 
        if (instances%2 != 0 && text2 != ""){ sel.value = sel.value + text2; } 
        else{ sel.value = sel.value + text1; } 
     }  
}

function imgPopup(lien,largeur,hauteur)
{
	window.open(lien, 'Image', 'height='+hauteur+', width='+largeur+', top=10, left=10, toolbar=no, menubar=no, location=no, directories=0, resizable=yes, scrollbars=yes, status=no');
}