function check_email(str){
	var testresults;	
	//var filter=/^.+@.+\..{2,3}$/ ;
	var filter = /^([a-z0-9])(([\-.]|[_]+)?([a-z0-9]+))*(@)([a-z0-9])((([-]+)?([a-z0-9]+))?)*((.[a-z]{2,3})?(.[a-z]{2,6}))$/i;
	
	if (filter.test(str)){
		testresults=true;
	}else{
		testresults=false;
	}
	return (testresults)
}