function openWindow(parametros, ancho, alto) {
		derecha=(screen.width-ancho)/2;
		arriba=(screen.height-alto)/2;
		string="toolbar=0,scrollbars=0,location=0,statusbar=0,menubar=0,resizable=1,width="+ancho+",height="+alto+",left="+derecha+",top="+arriba+"";
			
		fin=window.open('popup.php?'+parametros,"ventana", string);
	}
function openWindow2(pgn, parametros, ancho, alto, scrollbars, resizable) {
	derecha=(screen.width-ancho)/2;
	arriba=(screen.height-alto)/2;
	
	if(resizable==true)
		resizable = 1;
	else
		resizable = 0;
		
	if(scrollbars==true)
		scrollbars = 1;
	else
		scrollbars = 0;
	
	string="toolbar=0,scrollbars="+scrollbars+",location=0,statusbar=0,menubar=0,resizable="+resizable+",width="+ancho+",height="+alto+",left="+derecha+",top="+arriba+"";
		
	fin=window.open(pgn+'?'+parametros,"ventana", string);
}

function dimensionar(ancho, alto, centro) {
	if(centro==true) {
		derecha=(screen.width-ancho)/2;
		arriba=(screen.height-alto)/2;
		window.moveTo(derecha,arriba);
	}
	
	window.resizeTo(ancho,alto);
}

function darFoco(id) {
	id = document.getElementById(id);
	if(id)  {
		id.focus();
	} else {
		self.focus();
	}
}

function doPost(frm, params) {
	var frm = document.getElementById(frm);
	if(frm) {
		frm.action = params;
		frm.submit();
	}
}

function getCookieVal (offset) {
 var endstr = document.cookie.indexOf (";", offset);
 
 if (endstr == -1)
  endstr = document.cookie.length;
  
 return unescape(document.cookie.substring(offset, endstr));
}

function getCookie (name) {
 
 
 var arg = name + "=";
 var alen = arg.length;
 var clen = document.cookie.length;
 var i = 0;
 
 while (i < clen) {
  var j = i + alen;
  
  if (document.cookie.substring(i, j) == arg)
   return getCookieVal (j);
   
  i = document.cookie.indexOf(" ", i) + 1;
  
  if (i == 0) 
   break; 
 }

 return null;
}

function setCookie (name, value) {
 var argv = setCookie.arguments;
 var argc = setCookie.arguments.length;
 var expires = (2 < argc) ? argv[2] : null;
 var path = (3 < argc) ? argv[3] : null;
 var domain = (4 < argc) ? argv[4] : null;
 var secure = (5 < argc) ? argv[5] : false;
 
 path="/";
 
 document.cookie = name + "=" + escape (value) +
 ((expires == null) ? "" : ("; expires=" + expires.toGMTString())) +
 ((path == null) ? "" : ("; path=" + path)) +
 ((domain == null) ? "" : ("; domain=" + domain)) +
 ((secure == true) ? "; secure" : "");
}
function enviar()
 {
 var valor = document.form2.marcas.options[document.form2.marcas.selectedIndex].value; 
 //alert (valor);
 window.location = 'categorias.php?idcat='+valor;
 
 
 }
 /// cookies

var carro = document.getElementById("car");
function car(dom) {
   
	var objDom = document.getElementById(dom);
    
	if (confirm('Adicionar al carrito de compras ?') == true)
    { addToCar(dom);}
}


   function addToCar(dom) {
    
	var tmp = getCookie("car");
    
    if(tmp==null || tmp=='') {
     tmp = dom;
    }
	else
    
	 tmp = getCookie("car") +  "@" + dom;

    setCookie("car", tmp);
	window.location.reload(true);
   // showCar();
   }

   function deleteFromCar(dom) {
    var tmp;
    var arrTmp = Array();
    arrTmp = getCookie("car").split("@");
    tmp = "";
    var cc;
	cc=0;
	for(var i=0; i<arrTmp.length; i++) {
     
	 //si el item es distinto del q se elimina
	 if(dom!=arrTmp[i] && arrTmp[i]!='' && i!=arrTmp.length-1) {
       tmp += arrTmp[i] + "@";
	 }
	 
	 if(dom!=arrTmp[i] && arrTmp[i]!='' && i==arrTmp.length-1) {
       tmp += arrTmp[i];
	 }
	 
	 /// si el item esta repetido  y es el primero
	 if(dom==arrTmp[i] && arrTmp[i]!='' && cc==0 ) {
       cc=1;
	 }
	 
	 if(dom==arrTmp[i] && arrTmp[i]!='' &&  cc > 1 && i!=arrTmp.length-1) {
       tmp += arrTmp[i] + "@";
	 }
	 if(dom==arrTmp[i] && arrTmp[i]!='' &&  cc > 1 && i==arrTmp.length-1) {
       tmp += arrTmp[i];
	 }
	 
	 
	 if (cc==1) {
	   cc=2;
	 }
	  
    }

    setCookie("car", tmp);
    var objDomOriginal = document.getElementById(dom);

   
    //showCar();
   }