function changeImage(ImageName, ImageFile)
{
		ImageName.src = ImageFile;
}

function ridimensiona()
{
	self.moveTo(0,0);
	self.resizeTo(screen.availWidth,screen.availHeight);
}

function DisplayFlash(flash)
{
	document.getElementById(flash).style.visibility = "visible";
}

function isEmail(string) {
		if (string.search(/^\w+((-\w+)|(\.\w+))*\@\w+((\.|-)\w+)*\.\w+$/) != -1)
			return 1;
		else
			return 0;
	}
	
function isSubject(string) {
	if (string != "")
		return 1;
	else
		return 0;
}

function isMessage(string) {
	if (string != "")
		return 1;
	else
		return 0;
}	

function checkForm(form){
	
	if ( isEmail(form.emailFrom.value) == 0 ) 
	{
		alert("Insert a valid e-mail");
		form.emailFrom.focus();			
		return false
	}
	else if (isSubject(form.subject.value) == 0)
	{
		alert("Insert subject");
		form.subject.focus();
		return false
	}
	else if (isMessage(form.msg.value) == 0)
	{
		alert("Insert message");
		form.msg.focus();
		return false
	}
	
	form.submit;
}