function int_only(champ)
{
	var int = new RegExp("[0-9]");
	var crtl;
	
	for(x = 0; x < champ.value.length; x++)
	{
		crtl = int.test(champ.value.charAt(x));
		if(crtl == false)
		{
			champ.value = champ.value.substr(0,x) + champ.value.substr(x+1,champ.value.length-x+1); x--;
		}
	}
}