function copy_action() {   
	var contenu_arab = document.getElementById('contenu_arab'); 
  contenu_arab.select();
}

 
function change_size(btn,class_){
	btn.className=class_;
} 
 
function reset_action() {   
var contenu_arab = document.getElementById('contenu_arab');
var contenu_form = document.getElementById('form_clavier');
 contenu_form.reset();
 contenu_arab.focus(); 
}  
 
function  supprimer_contenu(){
	 var contenu_arab = document.getElementById('contenu_arab'); 
	 var contenu_arab_taille = contenu_arab.value.length
 if (contenu_arab_taille>0){
contenu_arab.value=contenu_arab.value.substring(0,contenu_arab_taille-1) 
 } 

}
function append_txt(txt) {  
//alert(txt);
	var zone_txt = document.forms["form_clavier"].saisie;
	
	//alert(zone_txt);
		/* if (document.selection) { 
		 alert(">>>>"+zone_txt); 
			range = document.selection.createRange() ;
			alert(">00>>>"+range); 
			range.text = txt ;
            range.select();  
		}
		else*/
		if (zone_txt.selectionStart || zone_txt.selectionStart == '0') {
		var selection_Start = zone_txt.selectionStart;
		var selection_End = zone_txt.selectionEnd;
		var var1 = selection_Start;
		var var2 = zone_txt.var2;
		var baselength = 0;
		var sub_zone=zone_txt.value.substring(selection_End, zone_txt.value.length);
		zone_txt.value = zone_txt.value.substring(0, selection_Start)  + txt + sub_zone;
		var1 += txt.length;
		zone_txt.focus();
		zone_txt.selectionStart = var1;
		zone_txt.selectionEnd = var1;
		zone_txt.var2 = var2;
		}
	else {
		zone_txt.value += txt;
		}
			zone_txt.focus();
}