function img_change(host, url)
{
 host.src = url;
}

function checkform()
{
	var webform = document.forms["emailform"];
	var flag = true;
	
	if(webform.mail_name.value == "")
	{
		alert("Please Provide your Name");
		webform.mail_name.focus();
		flag = false;
	}
	if(webform.mail_email.value == "")
	{
		alert("Please Provide your Email Address");
		webform.mail_email.focus();
		flag = false;
	}
	else
	{
		var filter  = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
		if (!filter.test(webform.mail_email.value))
		{
			alert("Please Provide a Valid Email Address");
			webform.mail_email.focus();
			flag = false;
		}
	}
	if(webform.mail_subject.value == "")
	{
		alert("Please Provide the Subject of the Email");
		webform.mail_subject.focus();
		flag = false;
	}
	if(webform.mail_content.value == "")
	{
		alert("Please Provide the Content of the Email");
		webform.mail_content.focus();
		flag = false;
	}
	
	if(!flag)
	{
		return false;
	}
	else
		return true;
		
}