function over(mn) {
mn.style.backgroundColor='#FFFFFF'; //#3484D7 #EE9C00
mn.style.cursor='hand';
mn.style.border='1px solid #FFFFFF'; //#A1C6EB
mn.style.color= '#0078C0';
}
function out(mn) {
mn.style.backgroundColor='';
mn.style.cursor='default';
mn.style.border='none';
mn.style.color= '#FFFFFF';
}
function tie(opt) {
	if (1 == opt){
	top.location.href='http://www.ant-ingenieria.com/en/index.htm';	
	}
	if (2 == opt){
	top.location.href='http://www.ant-ingenieria.com/en/company.htm';	
	}
	if (3 == opt){
	top.location.href='http://www.ant-ingenieria.com/en/fields.htm';	
	}
	if (4 == opt){
	top.location.href='http://www.ant-ingenieria.com/en/services.htm';	
	}
	if (5 == opt){
	top.location.href='http://www.ant-ingenieria.com/en/clients.htm';	
	}
	if (6 == opt){
	top.location.href='http://www.ant-ingenieria.com/en/partners.htm';	
	}
	if (7 == opt){
	top.location.href='http://www.ant-ingenieria.com/en/contacts.htm';	
	}
	if (8 == opt){
	top.location.href='http://www.ant-ingenieria.com/en/index.htm';	
	}
}
 <!-- the function "win()" open the window with - "javascript:win('name of document.html','name of window',width,height)"
  var page,wid,hit,nam;
  function win(page,nam,wid,hit){
   var  windo=eval('window.open("'+page+'","'+nam+'","status=no,toolbar=no,resizable=no,scrollbars=yes, menubar=no,width='+wid+',height='+hit+',top=10,left=10")');
   windo.focus();
  }
  //end of win(page,nam,wid,hit)
 //-->