function check()
	{
		
		var test=true;
		var message='';
		
		
		if (isEmpty(document.form_modif_site.email_du_proprio.value))
		{
			message+='\nYou forgot your Email !';
			test=false;
		} else if (isNotEmailAdress(document.form_modif_site.email_du_proprio.value))
		{
			message+='\nYour email seems to be not a valid email, please check it again !';
			test=false;
		}
		if (isEmpty(document.form_modif_site.nom_du_proprio.value))// && isNotIpAdress(document.form2.nom.value))
		{
			message+='\nYou forgot the Name of the site registration author  !';
			test=false;
		}
		if (isEmpty(document.form_modif_site.url_site.value) || isNotUrl(document.form_modif_site.url_site.value))
		{
			message+='\nThis URL is not valid, please check it again or read our conditions !';
			test=false;
		}
		
		if (isEmpty(document.form_modif_site.msg_proprio.value))// && isNotAlphabetic(document.form.msg.value))
		{
			message+='\nYou forgot the Message !';
			test=false;
		}
		
//verifie si on a bien selectionne une categorie dans la liste deroulante

		if (document.form_modif_site.choix_modif.value == 0)
		{
		message+='\nPlease choose the Subject of your demand !';
		test=false;
		}

		
		if (message!='') alert(message);
		return test; 
	}