function ResWindow(theURL,winName,width,height,features) { 
		if(window.screen){
		per_ancho=(width/800)*100;
		per_alto=(height/width)*100;
		win_ancho=(screen.width*per_ancho)/150;
		win_alto=(win_ancho*per_alto)/150;
		x=(screen.width-win_ancho)/2;
		y=(screen.height-win_alto)/2;
	}else{
		x=0;
		y=0;
		win_ancho=w;
		win_alto=y;
	}
	winfeatures=("top="+y+",left="+x+",width="+win_ancho+",height="+win_alto+","+features);
	window.open(theURL,winName,winfeatures);
	}