// JavaScript Document
function chkshowcar()
	 {
	    //var retval=true;
		var year=document.showcar.year.value
		var make=document.showcar.make.value
		var model=document.showcar.model.value
		var color=document.showcar.color.value
	 	var d = new Date();
		var curr_year = d.getFullYear();

		 if(make ==''){
		  alert("Enter make")
		  document.showcar.make.focus();
		  return false;
		}
		 if(model==''){
		  alert("Enter Model")
		  document.showcar.model.focus();
		   return  false;
		}
		
		if(year==''){
		  alert("Enter Year")
		  document.showcar.year.focus();
		  return  false;
		}else if(year>curr_year){
		   alert("Year entered greater than Current year")
		   document.showcar.year.focus();
		   return false;
		}else{
		  if(isNaN(year)== true)
	     {
		   alert("Enter vaild year")
		   document.showcar.year.focus();
		   return false;
		 }
		}
		if(color==''){
		  alert("Enter Color")
		  document.showcar.color.focus();
		   return false;
		}
		return true
	 }