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i have made three drop downs month year day{1,2,3...} i want only valid day gets displayed in the drop down. i.e if jan is selected 31 is the upper limit if feb is selected 28 or 29 depending upon the year (leap or not) var monthselected,yearselected,mtype=0,visited=0; function reassembleDate(){ if(monthselected==4||monthselected==6||monthselected==9||monthselected==11) {mtype=30;} …

start with HTML it is pretty easy understand inline styling. Then go for css. Then javascript. Some Server Side PHP,PERL,ASP.NET or anything else. for dynamic pages generation. I am PHP lover. css3 HTML5.. Now when you start with html dont aim at learning it completely.it will take time mastering everything. …

assuming you have a db of all the possible illness it is pretty easy to do so. IS connection to the database your problem or programming using if else is problem please specify.

try with javascript if( screen.width <= 480 ) { location.href = '/m.yourdomain.html'; } normally screen widths are lessor equal to 480 px for mobile devices. user agent is another method.