function funcion_popup(mi_pagina,myname,w,h,pos){
	var funcion_popupWindow = null;
	if(pos=='random')
	{
		LeftPosition=(screen.width)?Math.floor(Math.random()*(screen.width-w)):100;
		TopPosition=(screen.height)?Math.floor(Math.random()*((screen.height-h)-75)):100;
	}
	
	if(pos=='center'){
		LeftPosition=(screen.width)?(screen.width-w)/2:100;
		TopPosition=(screen.height)?(screen.height-h)/2:100;
	}
	
	else if((pos!='center' && pos!='random') || pos==null)
	{
		LeftPosition=100;TopPosition=100;
	}
	
	settings='width='+ w + ',height='+ h + ',top=' + TopPosition + ',left=' + LeftPosition + ',location=no,directories=no,menubar=no,toolbar=no,status=no,scrollbars=no,resizable=no,dependent=no';
	
	funcion_popupWindow=window.open(mi_pagina,myname,settings);
}