function previousNext() {
	var page=["P1_0.htm","P2_1.htm","P2_2.htm","P2_3.htm","P2_4.htm","P2_5.htm","P3_1.htm",
				"P3_2.htm","P4_1.htm","P4_2.htm","P4_3.htm","P4_4.htm","P5_0.htm","P6_1.htm","P6_2.htm",
				"P6_3.htm","P6_4.htm","P6_5.htm","P7_0.htm","P8_1.htm","P8_2.htm","P8_3.htm","P8_4.htm","P8_5.htm",
				"P8_6.htm","P9_0.htm","P10_0.htm"];
	var indexPage=0;
	//var maxIndexPage=30;
	var styleLink="previewNext";
	var toWrite;	
	var currentPage=top.location.href;

	while(currentPage.indexOf("/") != -1)  //recherche la page active
	{
		currentPage=currentPage.slice(currentPage.indexOf("/")+1);
	}

	if(currentPage.indexOf("#") != -1) //recherche s'il y a un #, si problème browser aller à la page précédente
	{
		window.history.go(-1);
	}
    else
	{
		//alert("top.location: " + top.location);
		//alert("before test currentPage:|" + currentPage + "|");
		//alert("before test currentPage.indexOf('#'): " + currentPage.indexOf("#"));
	
//		if(currentPage.indexOf("#") != -1) //recherche s'il y a un # à éliminer pour ne pas planter le script
//		{
//			currentPage=currentPage.substring(0,currentPage.indexOf("#"));
//		}
	
		//alert("after test currentPage:|" + currentPage + "|");
	
		while(page[indexPage] != currentPage)  //recherche la position de cette page dans la table "page"
		{
			indexPage++;
			if(indexPage > page.length)
			{
				break;
			}
		}

// alert("indexPage:|" + indexPage + "| et  > page.length: |" + page.length + "|");		

		if(indexPage <= page.length)
		{
			if(indexPage != 0)   //construit le code HTML pour les links ' [ Previous | Next ] '
			{
				toWrite="[ <a href=\"" + page[indexPage - 1] + "\" class=\"" + styleLink + "\">Previous</a> ";
				if((indexPage + 1) != page.length)
				{
					toWrite=toWrite + "| <a href=\"" + page[indexPage + 1] + "\" class=\"" + styleLink + "\">Next</a> ] ";
				}
				else
				{
					toWrite=toWrite + "] ";
				}
			}
			else
			{
				toWrite="[ <a href=\"" + page[indexPage + 1] + "\" class=\"" + styleLink + "\">Next</a> ] ";
			}
			document.write(toWrite);
		}
	}
}