function opentargetBlank() {
	for(var i=0; i<document.links.length; i++) {    	
		var id=document.links[i].id;
		if(id=="topbanner" || id=="image_banner" || id=="bottombanner") {
			document.links[i].target = "_blank";
		}
		
		for(var j=0; j<document.links.length; j++) {    	
			var link_id="imgbanner"+j;	
			
			if(id==link_id) {
				document.links[i].target = "_blank";
			}
		}
	}
}