function setcajaContacto(){
	var _w = (screen.width / 2);
	document.getElementById("cajaContacto").style.left = (_w - 220) + "px";
}

function scroll(ID, orientacion){
	document.getElementById(ID).scrollTop += orientacion;
}

function ampliar(){	
	if(document.getElementById("cajaContacto").style.top!="481px"){
		document.getElementById("ampliar_id").src = "imagenes/normal.jpg";
		document.getElementById("cajaContacto").style.top = 481 + "px";
		document.getElementById("cajaContacto").style.height = 150 + "px";
		document.getElementById("textoContacto").style.height = 150 + "px";		
	}else{		
		document.getElementById("ampliar_id").src = "imagenes/ampliar.jpg";
		document.getElementById("cajaContacto").style.top = 566 + "px";
		document.getElementById("cajaContacto").style.height = 65 + "px";
		document.getElementById("textoContacto").style.height = 43 + "px";	
		document.getElementById("textoContacto").scrollTop = 0;
	}
	
}