function formvalidation(){
	var isvalid=true;
	var myname=document.getElementById("myname").value;
	var mytel=document.getElementById("mytel").value;
	var myemail=document.getElementById("myemail").value;
	var mymsg=document.getElementById("mymsg").value;
	myname=myname.replace(/ /gi,"");
	mytel=mytel.replace(/ /gi,"");
	myemail=myemail.replace(/ /gi,"");
	mymsg=mymsg.replace(/ /gi,"").replace(/\r|\n|\r\n/g,"");
	if(myname.length<5){
		isvalid=false;
		alert("Please enter your name");
	}
	else if(mytel.length<9 || isNaN(mytel)){
		isvalid=false;
		alert("Please enter a valid telephone number");
	}
	else if(myemail.length>1 && (!isvalidemail(myemail))){
		isvalid=false;
		alert("Please enter a valid email address");
	}
	else if (mymsg.length<6){
		isvalid=false;
		alert("Please enter a message");	
	}
	return isvalid;
}

function isvalidemail(myvar){
	var isvalid=true;
	var reg = /^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,6})$/;
	if(reg.test(myvar) == false) {
		 isvalid=false;
	}
	return isvalid;
}